Date Difference
Elapsed Number of Days
  Table of Contents  v-16.01.01 - cblday01.htm 
  Introduction
  Programming Objectives
  Programming Input and Output
  Programming Requirements
  Programming Overview
  The Call Interface
  The CMD Files
  Run the Date-Difference Job
  Create a Date-Difference File
  The JCL Members
  Run the Date-Difference Job
  Create a Date-Difference File
  The COBOL Programs
  The Primary Program
  The Difference-in-Days Routine
  The Date Validation Routine
  Summary
  Software Agreement and Disclaimer
  Downloads and Links
  Current Server or Internet Access
  Internet Access Required
  Glossary of Terms
  Comments or Feedback
  Company Overview
The SimoTime Home Page 

Table of Contents Previous Section Next Section Introduction

This suite of programs provides an example of a techniques that may be used to calculate the number-of-days difference between two Gregorian dates in the ccyymmdd format. Allowances have been made for leap years with the four-year and four-hundred-year cycles. Three COBOL programs are provided. The first program is a demonstration program that reads a file containing "DATEDIFF" records and calls the second COBOL program that calculates the number-of-days difference between the two dates. The third program does the date validation, formatting and conversion. The COBOL programs are written using the COBOL/2 dialect but also work with COBOL for MVS and COBOL/370. A JCL member is provided to run the job as an MVS batch job on an IBM mainframe or as a project with Micro Focus Mainframe Express (MFE) running on a PC with Windows. This program may serve as a tutorial for new programmers and as a reference for experienced programmers. Additional information is provided in the Downloads and Links to Similar Pages section of this document.


We have made a significant effort to ensure the documents and software technologies are correct and accurate. We reserve the right to make changes without notice at any time. The function delivered in this version is based upon the enhancement requests from a specific group of users. The intent is to provide changes as the need arises and in a timeframe that is dependent upon the availability of resources.

Copyright © 1987-2017
SimoTime Technologies and Services
All Rights Reserved

Table of Contents Previous Section Next Section Programming Objectives

The following is a list of the functions provided in this example.

1 Accept two Gregorian dates as input.
2 Validate the month for 1-12 and create text string (i.e. month 7 is July).
3 Determine if the year is a leap year.
4 Validate the day for 1-30, 1-31, 1-28 or 1-29 based on month and leap year.
5 Calculate the difference between two dates in number of days.
  Determine Properties and Elapsed Time for and between Date Values

Table of Contents Previous Section Next Section Programming Input and Output

The following is an example of the contents of the input or date-difference file (SYSUT1).

DATEDIFF 19420124       19430522
DATEDIFF 20000401       20011225
DATEDIFF 20001315       20001689
DATEDIFF 2001/01/01     20010105
DATEDIFF 1999-01-32     1999-02-30
DATEDIFF 1999-02/15     2000-02/15
DATEDIFF 1995/03/15     1996/03/15
DATEDIFF 19420124       20011109
DATEDIFF 14920101       20010201
DATEDIFF 19951230       19960102
DATEDIFF 20031230       20040301

The following is an example of the output file (SYSUT2) based on the preceding date-difference file.

* CBLDAYC1 Difference Between Two Dates       v03.01.24 http://www.simotime.com
* CBLDAYC1 Copyright 1987-2012 --- SimoTime Enterprises --- All Rights Reserved
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 19420124       19430522
* CBLDAYC1 Difference in days..... 0000483
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 20000401       20011225
* CBLDAYC1 Difference in days..... 0000633
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 20001315       20001689
* SIMODATE NOK for Date Value, MM not 1 through 12...
* SIMODATE Program is ABENDING...
* CBLDAYC1 NOK for Date Value, MM not 1 through 12...
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 2001/01/01     20010105
* CBLDAYC1 Difference in days..... 0000004
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 1999-01-32     1999-02-30
* SIMODATE NOK for Day Value, DD not within month range...
* SIMODATE Program is ABENDING...
* CBLDAYC1 NOK for Day Value, DD not within month range...
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 1999-02/15     2000-02/15
* CBLDAYC1 Difference in days..... 0000365
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 1995/03/15     1996/03/15
* CBLDAYC1 Difference in days..... 0000366
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 19420124       20011109
* CBLDAYC1 Difference in days..... 0021838
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 14920101       20010201
* CBLDAYC1 Difference in days..... 0185942
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 19951230       19960102
* CBLDAYC1 Difference in days..... 0000003
* CBLDAYC1 ********************************************************************
* CBLDAYC1 DATEDIFF 20031230       20040301
* CBLDAYC1 Difference in days..... 0000062
* CBLDAYC1 SYSUT1 line count is 0000011
* CBLDAYC1 is Complete...
* CBLDAYC1 Thank you for using this software provided from SimoTime Enterprises
* CBLDAYC1 Please send all inquires or suggestions to the helpdesk@simotime.com

Table of Contents Previous Section Next Section Programming Requirements

This suite of samples programs will run on the following platforms.

1 Executes on Windows/XP, Windows/7 and Windows Server using Micro Focus Server or Studio.
2 May be ported to run on the Linux or UNIX platforms supported by Micro Focus COBOL.
3 Executes on an IBM Mainframe System with MVS or a Windows System using Micro Focus Mainframe Express.
  Operating Systems and Supporting Software

Table of Contents Previous Section Next Section Programming Overview

The following diagram is an overview of how the demonstration program fits into the example. The demonstration program will read the date difference file (SYSUT1) that contains two different dates in each record, call the date routines and write the resulting difference in days to the output file (SYSUT2).

             
Entry Point
ZOS
Entry Point
Windows
   
   
CBLDAYJ1
jcl
CBLDAYE1
cmd
Start the date processing example
   
   
IEFBR14
Utility
IF Exist
statement
Delete previously created Date Info file
   
   
 
 
   
   
 
 
   
   
SYSUT1
rseq
 
 
CBLDAYC1
cbl
 
 
SYSUT2
rseq
Read the date cards (SYSUT1), call the date routine then write the results to a file (SYSUT2.
   
   
   
End-of-File
Yes
No
   
call
 
 
   
   
   
CBLDAYC2
cbl
Calculate difference in days.
   
   
   
SIMODATE
cbl
Validate, format and convert the date.
   
   
   
   
EOJ
End-Of-Job
 
Overview of Process to Calculate the Elapsed Time between two Dates

Color Associations: The  light-green  boxes are unique to SIMOTIME Technologies using the Mainframe and Micro Focus Enterprise Server/Studio (or Micro Focus Mainframe Express). The  light-red  boxes are unique to the SIMOTIME Technologies using a Linux, UNIX or Windows System and COBOL Technologies such as Micro Focus. The  light-yellow  boxes are SIMOTIME Technologies, Third-party Technologies, decision points or program transitions in the processing logic or program generations. The  light-blue  boxes identify the input/output data structures such as Documents, Spreadsheets, Data Files, VSAM Data Sets or Relational Tables. The  light-gray  boxes identify a system function or information item.

Table of Contents Previous Section Next Section The Call Interface

The following is the syntax for calling the date routine (CBLDAYC2.CBL).

call 'CBLDAYC2' using DDF-PASS-AREA

The callable date routine will accept a Gregorian date and provide a data structure in the following format. A COBOL copy file (CBLDAYB1.cpy) is provided with the following fields defined.

      *****************************************************************
      *               CBLDAYB1.CPY - a COBOL Copy File                *
      *          Data structure for calling CBLDAYC2 Routine          *
      *         Copyright (C) 1987-2017 SimoTime Technologies         *
      *                     All Rights Reserved                       *
      *              Provided by SimoTime Technologies                *
      *        Our e-mail address is: helpdesk@simotime.com           *
      *     Also, visit our Web Site at http://www.simotime.com       *
      *****************************************************************
       01  DDF-PASS-AREA.
           05  DDF-REQUEST             pic X(8).
           05  DDF-RESPONSE            pic 9(4).
           05  DDF-MESSAGE-TEXT        pic X(68).
           05  DDF-GREGORIAN-DATE-1    pic X(10).
           05  DDF-GREGORIAN-DATE-2    pic X(10).
           05  DDF-DIFFERENCE-IN-DAYS  pic 9(7).
           05  DDF-JULIAN-DATE-1       pic 9(7).
           05  DDF-JULIAN-DATE-1-VALUE redefines DDF-JULIAN-DATE-1.
               10  DDF-JULIAN-CCYY-1   pic 9(4).
               10  DDF-JULIAN-DAY-1    pic 9(3).
           05  DDF-DAYS-REMAINING-1    pic 9(3).
           05  DDF-JULIAN-DATE-2       pic 9(7).
           05  DDF-JULIAN-DATE-2-VALUE redefines DDF-JULIAN-DATE-2.
               10  DDF-JULIAN-CCYY-2   pic 9(4).
               10  DDF-JULIAN-DAY-2    pic 9(3).
           05  DDF-DAYS-REMAINING-2    pic 9(3).
      *
      ***  CBLDAYB1 - End-of-Copy File - - - - - - - - - - - CBLDAYB1 *
      *****************************************************************
      *

The following table is an overview of the data strings used in the pass area for calling CBLDAYC2.

Field Name Description
DDF-REQUEST This is an eight character data string and should contain the following in upper case.
DATEDIFF This keyword causes the date-difference program (CBLDAYC2) to calculate the difference-in-days between the primary and secondary date.
This calling program must provide one of the above as a request. Otherwise, a non-zero return code will be set in the following result field. This data string is not changed by the conversion routine.
DDF-RESPONSE This is a four byte binary data string and is used by the calculation program to pass a return code. If the calcualtion request is successful the value in this data string will be zero.
DDF-MESSAGE-TEXT If a non-zero response occurs this field will contain a short message.
DDF-GREGORIAN-DATE-1

This is the primary input date field in gregorian format that will be used by the calculation program. If the gregorian date does not pass the editing process a message will be posted in the DDF-MESSAGE-TEXT field and a non-zero value of 16 will be placed in the DDF-RESPONSE field. SimoDATE is somewhat flexible in accepting and reformatting a gregorian date. For example, the following are acceptable and will be reformatted.

ccyymmdd   This is the preferred format.
ccyy-mm-dd    Special characters may be used as separators.
ccyy-m-d   Single digit month and day values are acceptable when separators are used.
ccyy/m/dd   A mixing of single digit usage is accepted.
DDF-GREGORIAN-DATE-2

This is the secondary input date field in gregorian format that will be used by the calculation program. If the gregorian date does not pass the editing process a message will be posted in the DDF-MESSAGE-TEXT field and a non-zero value of 16 will be placed in the DDF-RESPONSE field. SimoDATE is somewhat flexible in accepting and reformatting a gregorian date. For example, the following are acceptable and will be reformatted.

ccyymmdd   This is the preferred format.
ccyy-mm-dd    Special characters may be used as separators.
ccyy-m-d   Single digit month and day values are acceptable when separators are used.
ccyy/m/dd   A mixing of single digit usage is accepted.
DDF-DIFFERENCE-IN-DAYS This field contains the number-of-days difference between the primary and secondary dates. The contents of this field is provided by the calculation program.
DDF-JULIAN-DATE-1 This field contains the julian date for the primary gregorian date. The contents of this field is provided by the calculation program.
DDF-DAYS-REMAINING-1 This field is used for the number-of-days remaining in the year specified as the primary date. The contents of this field is provided by the calculation program.
DDF-JULIAN-DATE-2 This field contains the julian date for the secondary gregorian date. The contents of this field is provided by the calculation program.
DDF-DAYS-REMAINING-2 This field is used for the number-of-days remaining in the year specified as the secondary date. The contents of this field is provided by the calculation program.

 

Table of Contents Previous Section Next Section The CMD Files

This sample suite of programs has two CMD members. The first CMD member will execute the demonstration program. The second CMD member will create a Date Difference file.

Table of Contents Previous Section Next Section Run the Date-Difference Job

The following is the CMD file (CBLDAYE1.cmd) required to run the demonstration program on a Personal Computer with Micro Focus Net Express.

@echo OFF
rem  * *******************************************************************
rem  *               CBLDAYE1.CMD - a Windows Command File               *
rem  *         This program is provided by SimoTime Technologies         *
rem  *           (C) Copyright 1987-2017 All Rights Reserved             *
rem  *             Web Site URL:   http://www.simotime.com               *
rem  *                   e-mail:   helpdesk@simotime.com                 *
rem  * *******************************************************************
rem  *
rem  * Text   - Read a file of Date Records, calculate differences.
rem  * Author - SimoTime Technologies
rem  * Date   - January 24, 1996
rem  *
rem  * The job will read an 80-byte file that contains two dates per record
rem  * record. The job will then calculate the difference between the two
rem  * dates by number of days...
rem  *
rem  * This set of programs will run on a Personal Computer with Windows
rem  * and Micro Focus Net Express.
rem  *
rem  *    ************
rem  *    * CblDayE1 *
rem  *    ********cmd*
rem  *         *
rem  *    ************
rem  *    * If Exist *
rem  *    *******stmt*
rem  *         *
rem  *    ************     ************     ************
rem  *    * SimoEXEC ******* SIMOLOGS ******* CONSOLE  *
rem  *    ********cbl*  *  ********cbl*  *  ************
rem  *         *        *                *
rem  *         *        *                *  ************
rem  *         *        *                ****  SYSLOG  *
rem  *         *        *                   ********txt*
rem  *         *        *
rem  *         *        **************************
rem  *         *                                 *
rem  *         *           ************     ************     ************
rem  *         *           *  SYSUT1  ******* CblDayC1 *******  SYSUT2  *
rem  *         *           ********txt*     ********cbl*     ********csv*
rem  *         *
rem  *    ************
rem  *    *   EOJ    *
rem  *    ************
rem  *
rem  * *******************************************************************
rem  * Step 1 0f 3, Delete any previously created file...
rem  *
     set CmdName=CBlDayE1
     call ..\Env1BASE %CmdName%
rem  *
     call SimoNOTE "*******************************************************%CmdName%"
     call SimoNOTE "Starting JobName %CmdName%"
:DeleteQSAM
     call SimoNOTE "Identify JobStep DeleteQSAM"
     set SYSUT1=%BaseLib1%\DATA\Asc1\TWODATES.DAT
     set SYSUT2=%BaseLib1%\DATA\Wrk1\SIMOTIME.DATA.DIFFDAYS.DAT
     if exist %SYSUT2% del %SYSUT2%
rem  *
rem  * *******************************************************************
rem  * Step 2 of 3, Edit input, create a new output file...
rem  *
:ExecuteDateDifferenceRoutine
     call SimoNOTE "Identify JobStep ExecuteDateDifferenceRoutine"
     run CBLDAYC1
rem  * *******************************************************************
rem  * Step 3 of 3, ConvertRecord Sequential File to ASCII/TEXT file...
rem  *
     call SimoNOTE "Identify JobStep Convert Line Sequential to Record Sequential"
     set GETRS080=%BaseLib1%\DATA\Wrk1\SIMOTIME.DATA.DIFFDAYS.DAT
     set PUTLS080=%BaseLib1%\DATA\TXT1\SIMOTIME.DATA.DIFFDAYS.txt
     if exist %PUTLS080% del %PUTLS080%
     run CV80ARAL
     if exist %PUTLS080% call SimoNOTE "Produced DataSet %PUTLS080%"
     call SimoNOTE "Finished CmdName %CmdName%"
:End
     call SimoNOTE "Conclude SysLog is %SYSLOG%"
     if not "%1" == "nopause" pause

Table of Contents Previous Section Next Section Create a Date-Difference File

The following is the CMD file (CBLDAYE2.cmd) that may be used to create a date-difference file that is used as input..

@echo OFF
rem  * *******************************************************************
rem  *               CBLDAYE2.CMD - a Windows Command File               *
rem  *         This program is provided by SimoTime Technologies         *
rem  *           (C) Copyright 1987-2017 All Rights Reserved             *
rem  *             Web Site URL:   http://www.simotime.com               *
rem  *                   e-mail:   helpdesk@simotime.com                 *
rem  * *******************************************************************
rem  *
rem  * Text   - Create a Sequential Data Set on disk using ECHO function.
rem  * Author - SimoTime Technologies
rem  * Date   = January 24, 1996
rem  *
rem  * The first job step (DeleteQSAM) will delete any previously created
rem  * file. The second job step (CreateQSAM) will create a new file.
rem  *
rem  * This set of programs will run on a Personal Computer with Windows
rem  * and Micro Focus Net Express.
rem  *
     set CmdName=CblDayE2
     call ..\Env1BASE %CmdName%
     call SimoNOTE "*******************************************************%CmdName%"
     call SimoNOTE "Starting JobName %CmdName%"
rem  *
rem  * *******************************************************************
rem  * Step 1 of 3, Delete previously created QSAM file...
rem  *
:DeleteQSAM
     call SimoNOTE "Identify JobStep DeleteQSAM"
     set SYSUT1=%BaseLib1%\DATA\Txt1\TWODATES.TXT
     if exist %SYSUT1% del %SYSUT1%
rem  *
rem  * *******************************************************************
rem  * Step 2 of 3, Create and populate a new QSAM file...
rem  *
:CreateQSAM
      call SimoNOTE "Identify JobStep CreateQSAM"
rem  *....1....:....2....:....3....:....4....:....5....:....6....:....7....:....8
echo DATEDIFF 16000101       19420124      >%SYSUT1%
echo DATEDIFF 16000101       20000228     >>%SYSUT1%
echo DATEDIFF 16000101       20000301     >>%SYSUT1%
echo DATEDIFF 20000401       20011225     >>%SYSUT1%
echo DATEDIFF 20001315       20001689     >>%SYSUT1%
echo DATEDIFF 2001/01/01     20010105     >>%SYSUT1%
echo DATEDIFF 1999-01-32     1999-02-30   >>%SYSUT1%
echo DATEDIFF 1999-02/15     2000-02/15   >>%SYSUT1%
echo DATEDIFF 1995/03/15     1996/03/15   >>%SYSUT1%
echo DATEDIFF 19420124       20011109     >>%SYSUT1%
echo DATEDIFF 14920101       20010201     >>%SYSUT1%
echo DATEDIFF 19951230       19960102     >>%SYSUT1%
echo DATEDIFF 20031230       20040301     >>%SYSUT1%
echo DATEDIFF 20000101       20010101     >>%SYSUT1%
echo DATEDIFF 19000101       19010101     >>%SYSUT1%
echo DATEDIFF 18000101       18010101     >>%SYSUT1%
echo DATEDIFF 17000101       17010101     >>%SYSUT1%
echo DATEDIFF 16000101       16010101     >>%SYSUT1%
echo DATEDIFF 18000101       19010101     >>%SYSUT1%
rem  *
rem  * *******************************************************************
rem  * Step 3 of 3, Convert ASCII/TEXT file to ASCII RSEQ File...
rem  *
     call SimoNOTE "StepInfo Convert Line Sequential to Record Sequential"
     set GETLS080=%SYSUT1%
     set PUTRS080=%BaseLib1%\DATA\Asc1\TWODATES.DAT
     if exist %PUTRS080% del %PUTRS080%
     run CV80ALAR
     if not ERRORLEVEL = 0 set JobStatus=0030
     if not %JobStatus% == 0000 goto :EojNok
     call SimoNOTE "DataTake %GETLS080%"
     call SimoNOTE "DataMake %PUTRS080%"
     call SimoNOTE "Finished JobName %CmdName%"
:End
     call SimoNOTE "Conclude SysLog is %SYSLOG%"
     if not "%1" == "nopause" pause

Table of Contents Previous Section Next Section The JCL Members

This sample suite of programs has two JCL members. The first JCL member will execute the demonstration program. The second JCL member will create a DATE-DIFF file.

Table of Contents Previous Section Next Section Run the Date-Difference Job

The following is the JCL member (CBLDAYJ1.jcl) required to run the demonstration program on the mainframe or with Micro Focus Mainframe Express.

//CBLDAYJ1 JOB SIMOTIME,CLASS=1,MSGCLASS=0,NOTIFY=CSIP1
//* *******************************************************************
//*       CBLDAYJ1.JCL - a JCL Member for Batch Job Processing        *
//*       This JCL Member is provided by SimoTime Technologies        *
//*           (C) Copyright 1987-2017 All Rights Reserved             *
//*             Web Site URL:   http://www.simotime.com               *
//*                   e-mail:   helpdesk@simotime.com                 *
//* *******************************************************************
//*
//* Text   - Read a file of Date Cards, calculate difference in days.
//* Author - SimoTime Technologies
//* Date   - January 24, 1996
//*
//* The job will read an 80-byte file that contains DATEDIFF
//* requests. The job will also write a file containing the results
//* of the date-difference calculation.
//*
//* This set of programs will run on a mainframe under MVS or on a
//* Personal Computer with Windows and Micro Focus Mainframe Express.
//*
//*                     ************
//*                     * CBLDAYJ1 *
//*                     ********jcl*
//*                          *
//*                     ************
//*                     * IEFBR14  *
//*                     ************
//*                          *
//*    ************     ************     ************
//*    *  SYSUT1  *-----* CBLDAYC1 *-----*  SYSUT2  *
//*    ************     ************     ************
//*                          *
//*                     ************
//*                     *   EOJ    *
//*                     ************
//*
//* *******************************************************************
//* Step 1 of 2, Delete any previously created file...
//*
//QSAMDELT EXEC PGM=IEFBR14
//QSYSUT2  DD  DSN=SIMOTIME.DATA.DIFFDAYS,DISP=(MOD,DELETE,DELETE),
//             STORCLAS=MFI,
//             SPACE=(TRK,5),
//             DCB=(RECFM=FB,LRECL=80,BLKSIZE=800,DSORG=PS)
//*
//* *******************************************************************
//* Step 2 of 2, Edit input, create a new output file...
//*
//EXECDAT1 EXEC PGM=CBLDAYC1
//STEPLIB  DD  DSN=SIMOTIME.DEMO.LOADLIB1,DISP=SHR
//SYSUT1   DD  DSN=SIMOTIME.DATA.DIFFDATE,DISP=SHR
//SYSUT2   DD  DSN=SIMOTIME.DATA.DIFFDAYS,
//             DISP=(NEW,CATLG,DELETE),
//             STORCLAS=MFI,
//             SPACE=(TRK,5),
//             DCB=(RECFM=FB,LRECL=80,BLKSIZE=800,DSORG=PS)
//SYSOUT   DD  SYSOUT=*
//

Table of Contents Previous Section Next Section Create a Date-Difference File

The following is the JCL member (CBLDAYJ2.jcl) that may be used to create a date-diff file that will be used as input.

//CBLDAYJ2 JOB SIMOTIME,CLASS=1,MSGCLASS=0,NOTIFY=CSIP1
//* *******************************************************************
//*       CBLDAYJ2.JCL - a JCL Member for Batch Job Processing        *
//*       This JCL Member is provided by SimoTime Technologies        *
//*           (C) Copyright 1987-2017 All Rights Reserved             *
//*             Web Site URL:   http://www.simotime.com               *
//*                   e-mail:   helpdesk@simotime.com                 *
//* *******************************************************************
//*
//* Text   - Create a Sequential Data Set on disk using IEBGENER.
//* Author - SimoTime Technologies
//* Date   - January 24, 1996
//*
//* The first job step (DELTQSAM) will delete any previously created
//* file. The second job step (CRTQNAME) will create a new file.
//*
//* This set of programs will run on a mainframe under MVS or on a
//* Personal Computer with Windows and Micro Focus Mainframe Express.
//*
//* *******************************************************************
//* Step 1 of 2, Delete any previously created file...
//*
//QSAMDELT EXEC PGM=IEFBR14
//SYSUT2   DD  DSN=SIMOTIME.DATA.DIFFDATE,DISP=(MOD,DELETE,DELETE),
//             STORCLAS=MFI,
//             SPACE=(TRK,5),
//             DCB=(RECFM=FB,LRECL=80,BLKSIZE=800,DSORG=PS)
//*
//* *******************************************************************
//* Step 2 of 2, Create and populate a new QSAM file...
//*
//QCRTDIN1 EXEC PGM=IEBGENER
//SYSPRINT DD  SYSOUT=*
//SYSIN    DD  DUMMY
//* :....1....:....2....:....3....:....4....:....5....:....6....:....7.
//SYSUT1   DD  *
DATEDIFF 19420124       19430522
DATEDIFF 20000401       20011225
DATEDIFF 20001315       20001689
DATEDIFF 2001/01/01     20010105
DATEDIFF 1999-01-32     1999-02-30
DATEDIFF 1999-02/15     2000-02/15
DATEDIFF 1995/03/15     1996/03/15
DATEDIFF 19420124       20011109
DATEDIFF 14920101       20010201
DATEDIFF 19951230       19960102
DATEDIFF 20031230       20040301
DATEDIFF 15821014       19880516
/*
//SYSUT2   DD  DSN=SIMOTIME.DATA.DIFFDATE,
//             DISP=(NEW,CATLG,DELETE),
//             STORCLAS=MFI,
//             SPACE=(TRK,5),
//             DCB=(RECFM=FB,LRECL=80,BLKSIZE=800,DSORG=PS)
//

Table of Contents Previous Section Next Section The COBOL Programs

This example includes three COBOL programs. The primary program reads a file containing records with a set of two dates in a cccc-mm-dd format. The primary program calls the COBOL routines to process the dates and the "difference in days" information is written to an output file and posted to the SYSOUT device.

Table of Contents Previous Section Next Section The Primary Program

The demonstration program (CBLDAYC1.cbl) will read the date difference file (SYSUT1), call the date routines and write the results to the output file (SYSUT2). The following is the source code listing for the demonstration program.

       IDENTIFICATION DIVISION.
       PROGRAM-ID.    CBLDAYC1.
       AUTHOR.        SIMOTIME TECHNOLOGIES.
      *****************************************************************
      * Copyright (C) 1987-2017 SimoTime Technologies.                *
      *                                                               *
      * All rights reserved.  Unpublished, all rights reserved under  *
      * copyright law and international treaty.  Use of a copyright   *
      * notice is precautionary only and does not imply publication   *
      * or disclosure.                                                *
      *                                                               *
      * Permission to use, copy, modify and distribute this software  *
      * for any non-commercial purpose and without fee is hereby      *
      * granted, provided the SimoTime copyright notice appear on all *
      * copies of the software. The SimoTime name or Logo may not be  *
      * used in any advertising or publicity pertaining to the use    *
      * of the software without the written permission of SimoTime    *
      * Technologies.                                                 *
      *                                                               *
      * Permission to use, copy, modify and distribute this software  *
      * for any commercial purpose requires a fee to be paid to       *
      * SimoTime Technologies. Once the fee is received by SimoTime   *
      * the latest version of the software will be delivered and a    *
      * license will be granted for use within an enterprise,         *
      * provided the SimoTime copyright notice appear on all copies   *
      * of the software. The SimoTime name or Logo may not be used    *
      * in any advertising or publicity pertaining to the use of the  *
      * software without the written permission of SimoTime           *
      * Technologies.                                                 *
      *                                                               *
      * SimoTime Technologies makes no warranty or representations    *
      * about the suitability of the software for any purpose. It is  *
      * provided "AS IS" without any expressed or implied warranty,   *
      * including the implied warranties of merchantability, fitness  *
      * for a particular purpose and non-infringement. SimoTime       *
      * Technologies shall not be liable for any direct, indirect,    *
      * special or consequential damages resulting from the loss of   *
      * use, data or projects, whether in an action of contract or    *
      * tort, arising out of or in connection with the use or         *
      * performance of this software                                  *
      *                                                               *
      * SimoTime Technologies                                         *
      * 15 Carnoustie Drive                                           *
      * Novato, CA 94949-5849                                         *
      * 415.883.6565                                                  *
      *                                                               *
      * RESTRICTED RIGHTS LEGEND                                      *
      * Use, duplication, or disclosure by the Government is subject  *
      * to restrictions as set forth in subparagraph (c)(1)(ii) of    *
      * the Rights in Technical Data and Computer Software clause at  *
      * DFARS 52.227-7013 or subparagraphs (c)(1) and (2) of          *
      * Commercial  Computer Software - Restricted Rights  at 48      *
      * CFR 52.227-19, as applicable.  Contact SimoTime Technologies, *
      * 15 Carnoustie Drive, Novato, CA 94949-5849.                   *
      *                                                               *
      *****************************************************************
      *      This program is provided by SimoTime Technologies        *
      *        Our e-mail address is: helpdesk@simotime.com           *
      *     Also, visit our Web Site at http://www.simotime.com       *
      *                                                               *
      *****************************************************************
      *
      *****************************************************************
      * Source Member: CBLDAYC1.CBL
      * Copy Files:    CBLDAYB1.CPY
      * Calls to:      CBLDAYC2
      *                SIMODATE       via CBLDAYC2
      *****************************************************************
       ENVIRONMENT DIVISION.
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
           SELECT SYSUT1-FILE  ASSIGN to       SYSUT1
                  ORGANIZATION is SEQUENTIAL
                  ACCESS MODE  is SEQUENTIAL
                  FILE STATUS  is SYSUT1-STATUS.
           SELECT SYSUT2-FILE  ASSIGN to       SYSUT2
                  ORGANIZATION is SEQUENTIAL
                  ACCESS MODE  is SEQUENTIAL
                  FILE STATUS  is SYSUT2-STATUS.
      *
      *****************************************************************
       DATA DIVISION.
       FILE SECTION.
       FD  SYSUT1-FILE
           BLOCK CONTAINS 00800 CHARACTERS
           DATA RECORD    is SYSUT1-RECORD
           .
       01  SYSUT1-RECORD.
           05  SYSUT1-DATA-01.
               10  SYSUT1-KEYWORD  pic X(0008).
               10  SYSUT1-BLANK    pic X.
               10  SYSUT1-G1       pic X(10).
               10  filler          pic X(5).
               10  SYSUT1-G2       pic X(10).
               10  filler          pic X(46).
      *
       FD  SYSUT2-FILE
           BLOCK CONTAINS 00800 CHARACTERS
           DATA RECORD    is SYSUT2-RECORD
           .
       01  SYSUT2-RECORD.
           05  SYSUT2-DATA-01  pic X(00080).
      *
       WORKING-STORAGE SECTION.
       01  SIM-TITLE.
           05  T1 pic X(11) value '* CBLDAYC1 '.
           05  T2 pic X(34) value 'Difference Between Two Dates      '.
           05  T3 pic X(10) value ' v03.01.24'.
           05  T4 pic X(24) value ' http://www.simotime.com'.
       01  SIM-COPYRIGHT.
           05  C1 pic X(11) value '* CBLDAYC1 '.
           05  C2 pic X(20) value 'Copyright 1987-2017 '.
           05  C3 pic X(28) value '   SimoTime Technologies    '.
           05  C4 pic X(20) value ' All Rights Reserved'.
      *
       01  SIM-THANKS-01.
           05  C1 pic X(11) value '* CBLDAYC1 '.
           05  C2 pic X(32) value 'Thank you for using this program'.
           05  C3 pic X(32) value ' provided from SimoTime Technolo'.
           05  C4 pic X(04) value 'gies'.

       01  SIM-THANKS-02.
           05  C1 pic X(11) value '* CBLDAYC1 '.
           05  C2 pic X(32) value 'Please send all inquires or sugg'.
           05  C3 pic X(32) value 'estions to the helpdesk@simotime'.
           05  C4 pic X(04) value '.com'.
      *
       01  MESSAGE-BUFFER.
           05  MESSAGE-HEADER      pic X(11)   value '* CBLDAYC1 '.
           05  MESSAGE-TEXT.
               10  MESSAGE-TEXT-1  pic X(68)   value SPACES.
               10  MESSAGE-TEXT-2  pic X(188)  value SPACES.
      *
       01  SYSUT1-STATUS.
           05  SYSUT1-STATUS-L     pic X.
           05  SYSUT1-STATUS-R     pic X.
       01  SYSUT1-EOF              pic X       value 'N'.
       01  SYSUT1-OPEN-FLAG        pic X       value 'C'.
      *
       01  SYSUT2-STATUS.
           05  SYSUT2-STATUS-L     pic X.
           05  SYSUT2-STATUS-R     pic X.
       01  SYSUT2-EOF              pic X       value 'N'.
       01  SYSUT2-OPEN-FLAG        pic X       value 'C'.
      *
       01  IO-STATUS.
           05  IO-STAT1            pic X.
           05  IO-STAT2            pic X.
       01  TWO-BYTES.
           05  TWO-BYTES-LEFT      pic X.
           05  TWO-BYTES-RIGHT     pic X.
       01  TWO-BYTES-BINARY        redefines TWO-BYTES pic 9(4) comp.
      *
       01  APPL-RESULT             pic S9(9)   comp.
           88  APPL-AOK            value 0.
           88  APPL-EOF            value 16.
      *
       01  SYSUT1-TOTAL.
           05  filler      pic X(21)   value 'SYSUT1 line count is '.
           05  SYSUT1-LOC  pic 9(7)    value 0.
      *
      *****************************************************************
      * The following copy file of the pass area for calling SIMODATE,
      * the date editing routine.
      *****************************************************************
      *
       COPY CBLDAYB1.
      *
      *****************************************************************
       PROCEDURE DIVISION.
           perform Z-POST-COPYRIGHT
           perform SYSUT1-OPEN
           perform SYSUT2-OPEN
      *
           perform until SYSUT1-STATUS not = '00'
               perform SYSUT1-READ
               if  SYSUT1-STATUS = '00'
                   add 1 to SYSUT1-LOC
                   perform DATE-DIFFERENCE-CALCULATION
                   if  DDF-RESPONSE = 0
                       perform DATE-FUNCTION-DISPLAY
                   else
                       move DDF-MESSAGE-TEXT to MESSAGE-TEXT
                       perform Z-DISPLAY-CONSOLE-MESSAGE
                       move DDF-MESSAGE-TEXT to SYSUT2-DATA-01
                       perform SYSUT2-WRITE
                   end-if
               end-if
           end-perform
      *
           move SYSUT1-TOTAL to MESSAGE-TEXT
           perform Z-DISPLAY-CONSOLE-MESSAGE
      *
           if  APPL-EOF
               move 'is Complete...' to MESSAGE-TEXT
           else
               move 'is ABENDING...' to MESSAGE-TEXT
           end-if
           perform Z-DISPLAY-CONSOLE-MESSAGE
      *
           perform SYSUT2-CLOSE
           perform SYSUT1-CLOSE
           perform Z-THANK-YOU.
           GOBACK.
      *
      *****************************************************************
      * The following routines are in alphabetical sequence..         *
      *****************************************************************
      *
      *****************************************************************
       DATE-FUNCTION-DISPLAY.
           move 'Difference in days..... ' to MESSAGE-TEXT
           move DDF-DIFFERENCE-IN-DAYS     to MESSAGE-TEXT(25:7)
           move MESSAGE-TEXT               to SYSUT2-DATA-01
           perform Z-DISPLAY-CONSOLE-MESSAGE
           perform SYSUT2-WRITE
           exit.
      *
      *****************************************************************
       DATE-DIFFERENCE-CALCULATION.
           move all '*' to MESSAGE-TEXT-1
           perform Z-DISPLAY-CONSOLE-MESSAGE
           move all '*' to SYSUT2-DATA-01
           perform SYSUT2-WRITE

           move SYSUT1-DATA-01 to MESSAGE-TEXT
           perform Z-DISPLAY-CONSOLE-MESSAGE
           move SYSUT1-DATA-01 to SYSUT2-DATA-01
           perform SYSUT2-WRITE

           move 'DATEDIFF'           to DDF-REQUEST
           move SYSUT1-G1            to DDF-GREGORIAN-DATE-1
           move SYSUT1-G2            to DDF-GREGORIAN-DATE-2
           call 'CBLDAYC2' using DDF-PASS-AREA

           exit.
      *
      *****************************************************************
      * I/O ROUTINES FOR SYSUT1...                                    *
      *****************************************************************
       SYSUT1-CLOSE.
           add 8 to ZERO giving APPL-RESULT.
           close SYSUT1-FILE
           if  SYSUT1-STATUS = '00'
               subtract APPL-RESULT from APPL-RESULT
           else
               add 12 to ZERO giving APPL-RESULT
           end-if
           if  APPL-AOK
               CONTINUE
           else
               move 'SYSUT1-Failure-CLOSE...' to MESSAGE-TEXT
               perform Z-DISPLAY-CONSOLE-MESSAGE
               move SYSUT1-STATUS to IO-STATUS
               perform Z-DISPLAY-IO-STATUS
               perform Z-ABEND-PROGRAM
           end-if
           exit.
      *---------------------------------------------------------------*
       SYSUT1-READ.
           read SYSUT1-FILE
           if  SYSUT1-STATUS = '00'
               subtract APPL-RESULT from APPL-RESULT
           else
               if  SYSUT1-STATUS = '10'
                   add 16 to ZERO giving APPL-RESULT
               else
                   add 12 to ZERO giving APPL-RESULT
               end-if
           end-if
           if  APPL-AOK
               CONTINUE
           else
               if  APPL-EOF
                   move 'Y' to SYSUT1-EOF
               else
                   move 'SYSUT1-Failure-GET...' to MESSAGE-TEXT
                   perform Z-DISPLAY-CONSOLE-MESSAGE
                   move SYSUT1-STATUS to IO-STATUS
                   perform Z-DISPLAY-IO-STATUS
                   perform Z-ABEND-PROGRAM
               end-if
           end-if
           exit.
      *---------------------------------------------------------------*
       SYSUT1-OPEN.
           add 8 to ZERO giving APPL-RESULT.
           open input SYSUT1-FILE
           if  SYSUT1-STATUS = '00'
               subtract APPL-RESULT from APPL-RESULT
               move 'O' to SYSUT1-OPEN-FLAG
           else
               add 12 to ZERO giving APPL-RESULT
           end-if
           if  APPL-AOK
               CONTINUE
           else
               move 'SYSUT1-Failure-OPEN...' to MESSAGE-TEXT
               perform Z-DISPLAY-CONSOLE-MESSAGE
               move SYSUT1-STATUS to IO-STATUS
               perform Z-DISPLAY-IO-STATUS
               perform Z-ABEND-PROGRAM
           end-if
           exit.
      *
      *****************************************************************
      * I/O ROUTINES FOR SYSUT2...                                    *
      *****************************************************************
       SYSUT2-WRITE.
           if  SYSUT2-OPEN-FLAG = 'C'
               perform SYSUT2-OPEN
           end-if
           write SYSUT2-RECORD
           if  SYSUT2-STATUS = '00'
               subtract APPL-RESULT from APPL-RESULT
           else
               if  SYSUT2-STATUS = '10'
                   add 16 to ZERO giving APPL-RESULT
               else
                   add 12 to ZERO giving APPL-RESULT
               end-if
           end-if.
           if  APPL-AOK
               CONTINUE
           else
               move 'SYSUT2-Failure-WRITE...' to MESSAGE-TEXT
               perform Z-DISPLAY-CONSOLE-MESSAGE
               move SYSUT2-STATUS to IO-STATUS
               perform Z-DISPLAY-IO-STATUS
               perform Z-ABEND-PROGRAM
           end-if
           exit.
      *---------------------------------------------------------------*
       SYSUT2-OPEN.
           add 8 to ZERO giving APPL-RESULT.
           open output SYSUT2-FILE
           if  SYSUT2-STATUS = '00'
               subtract APPL-RESULT from APPL-RESULT
               move 'O' to SYSUT2-OPEN-FLAG
           else
               add 12 to ZERO giving APPL-RESULT
           end-if
           if  APPL-AOK
               CONTINUE
           else
               move 'SYSUT2-Failure-OPEN...' to MESSAGE-TEXT
               perform Z-DISPLAY-CONSOLE-MESSAGE
               move SYSUT2-STATUS to IO-STATUS
               perform Z-DISPLAY-IO-STATUS
               perform Z-ABEND-PROGRAM
           end-if
           exit.
      *---------------------------------------------------------------*
       SYSUT2-CLOSE.
           add 8 to ZERO giving APPL-RESULT.
           close SYSUT2-FILE
           if  SYSUT2-STATUS = '00'
               subtract APPL-RESULT from APPL-RESULT
               move 'C' to SYSUT2-OPEN-FLAG
           else
               add 12 to ZERO giving APPL-RESULT
           end-if
           if  APPL-AOK
               CONTINUE
           else
               move 'SYSUT2-Failure-CLOSE...' to MESSAGE-TEXT
               perform Z-DISPLAY-CONSOLE-MESSAGE
               move SYSUT2-STATUS to IO-STATUS
               perform Z-DISPLAY-IO-STATUS
               perform Z-ABEND-PROGRAM
           end-if
           exit.
      *
      *****************************************************************
      * The following Z-Routines perform administrative tasks         *
      * for this program.                                             *
      *****************************************************************
      *
      *****************************************************************
      * ABEND the program, post a message to the console and issue    *
      * a STOP RUN.                                                   *
      *****************************************************************
       Z-ABEND-PROGRAM.
           if  MESSAGE-TEXT not = SPACES
               perform Z-DISPLAY-CONSOLE-MESSAGE
           end-if
           move 'PROGRAM-IS-ABENDING...'  to MESSAGE-TEXT
           perform Z-DISPLAY-CONSOLE-MESSAGE
           add 12 to ZERO giving RETURN-CODE
           STOP RUN.
      *    exit.
      *
      *****************************************************************
      * Display CONSOLE messages...                                   *
      *****************************************************************
       Z-DISPLAY-CONSOLE-MESSAGE.
           if MESSAGE-TEXT-2 = SPACES
               display MESSAGE-BUFFER(1:79)
           else
               display MESSAGE-BUFFER
           end-if
           move all SPACES to MESSAGE-TEXT
           exit.
      *
      *****************************************************************
      * Display the file status bytes. This routine will display as   *
      * two digits if the full two byte file status is numeric. If    *
      * second byte is non-numeric then it will be treated as a       *
      * binary number.                                                *
      *****************************************************************
       Z-DISPLAY-IO-STATUS.
           if  IO-STATUS not NUMERIC
           or  IO-STAT1    = '9'
               subtract TWO-BYTES-BINARY from TWO-BYTES-BINARY
               move IO-STAT2 to TWO-BYTES-RIGHT
               display '* CBLDAYC1 File-Status-' IO-STAT1 '/'
                       TWO-BYTES-BINARY upon console
               display '* CBLDAYC1 File-Status-' IO-STAT1 '/'
                       TWO-BYTES-BINARY
           else
               display '* CBLDAYC1 File-Status-' IO-STATUS upon console
               display '* CBLDAYC1 File-Status-' IO-STATUS
           end-if
           exit.
      *
      *****************************************************************
       Z-POST-COPYRIGHT.
           display SIM-TITLE
           display SIM-COPYRIGHT
           exit.
      *
      *****************************************************************
       Z-THANK-YOU.
           display SIM-THANKS-01
           display SIM-THANKS-02
           exit.
      *****************************************************************
      *      This example is provided by SimoTime Technologies        *
      *        Our e-mail address is: helpdesk@simotime.com           *
      *     Also, visit our Web Site at http://www.simotime.com       *
      *****************************************************************

Table of Contents Previous Section Next Section The Difference-in-Days Routine

The following (CBLDAYC2.cbl) is the source code listing for the program that calculates the difference-in-days between two dates.

       IDENTIFICATION DIVISION.
       PROGRAM-ID.    CBLDAYC2.
       AUTHOR.        SIMOTIME TECHNOLOGIES.
      *****************************************************************
      * Copyright (C) 1987-2017 SimoTime Technologies.                *
      *                                                               *
      * All rights reserved.  Unpublished, all rights reserved under  *
      * copyright law and international treaty.  Use of a copyright   *
      * notice is precautionary only and does not imply publication   *
      * or disclosure.                                                *
      *                                                               *
      * Permission to use, copy, modify and distribute this software  *
      * for any non-commercial purpose and without fee is hereby      *
      * granted, provided the SimoTime copyright notice appear on all *
      * copies of the software. The SimoTime name or Logo may not be  *
      * used in any advertising or publicity pertaining to the use    *
      * of the software without the written permission of SimoTime    *
      * Technologies.                                                 *
      *                                                               *
      * Permission to use, copy, modify and distribute this software  *
      * for any commercial purpose requires a fee to be paid to       *
      * SimoTime Technologies. Once the fee is received by SimoTime   *
      * the latest version of the software will be delivered and a    *
      * license will be granted for use within an enterprise,         *
      * provided the SimoTime copyright notice appear on all copies   *
      * of the software. The SimoTime name or Logo may not be used    *
      * in any advertising or publicity pertaining to the use of the  *
      * software without the written permission of SimoTime           *
      * Technologies.                                                 *
      *                                                               *
      * SimoTime Technologies makes no warranty or representations    *
      * about the suitability of the software for any purpose. It is  *
      * provided "AS IS" without any expressed or implied warranty,   *
      * including the implied warranties of merchantability, fitness  *
      * for a particular purpose and non-infringement. SimoTime       *
      * Technologies shall not be liable for any direct, indirect,    *
      * special or consequential damages resulting from the loss of   *
      * use, data or projects, whether in an action of contract or    *
      * tort, arising out of or in connection with the use or         *
      * performance of this software                                  *
      *                                                               *
      * SimoTime Technologies                                         *
      * 15 Carnoustie Drive                                           *
      * Novato, CA 94949-5849                                         *
      * 415.883.6565                                                  *
      *                                                               *
      * RESTRICTED RIGHTS LEGEND                                      *
      * Use, duplication, or disclosure by the Government is subject  *
      * to restrictions as set forth in subparagraph (c)(1)(ii) of    *
      * the Rights in Technical Data and Computer Software clause at  *
      * DFARS 52.227-7013 or subparagraphs (c)(1) and (2) of          *
      * Commercial  Computer Software - Restricted Rights  at 48      *
      * CFR 52.227-19, as applicable.  Contact SimoTime Technologies, *
      * 15 Carnoustie Drive, Novato, CA 94949-5849.                   *
      *                                                               *
      *****************************************************************
      *      This program is provided by SimoTime Technologies        *
      *        Our e-mail address is: helpdesk@simotime.com           *
      *     Also, visit our Web Site at http://www.simotime.com       *
      *                                                               *
      *****************************************************************
      *
      *****************************************************************
      * Source Member: CBLDAYC2.CBL
      * Copy Files:    PASSDATE.CPY
      * Calls to:      SIMODATE
      *****************************************************************
      *
       DATA DIVISION.
      *
       WORKING-STORAGE SECTION.
       01  SIM-TITLE.
           05  T1 pic X(11) value '* CBLDAYC2 '.
           05  T2 pic X(34) value 'Calculate Date Differences in Days'.
           05  T3 pic X(10) value ' v04.03.18'.
           05  T4 pic X(24) value ' http://www.simotime.com'.
       01  SIM-COPYRIGHT.
           05  C1 pic X(11) value '* CBLDAYC2 '.
           05  C2 pic X(20) value 'Copyright 1987-2017 '.
           05  C3 pic X(28) value '   SimoTime Technologies    '.
           05  C4 pic X(20) value ' All Rights Reserved'.
      *
       01  MESSAGE-BUFFER.
           05  MESSAGE-HEADER      pic X(11)   value '* CBLDAYC2 '.
           05  MESSAGE-TEXT.
               10  MESSAGE-TEXT-1  pic X(68)   value SPACES.
               10  MESSAGE-TEXT-2  pic X(188)  value SPACES.
      *
       01  APPL-RESULT             pic S9(9)   comp.
           88  APPL-AOK            value 0.
           88  APPL-EOF            value 16.
      *
       01  DIFF-OF-YEARS           pic 9(4)    value 0.
       01  DIFF-OF-DAYS            pic 9(7)    value 0.
       01  MULTIPLE-YEARS          pic 9(7)    value 0.
       01  NUMBER-OF-LEAP-YEARS    pic 9(7)    value 0.
       01  HOLD-REMAINDER-1        pic 9(7)    value 0.
       01  HOLD-REMAINDER-2        pic 9(7)    value 0.
       01  REGISTER-7-0            pic 9(7)    value 0.
      *
      *****************************************************************
      * The following copy file of the pass area for calling CBLDAYB1,
      * the date difference routine.
      *****************************************************************
      *
       COPY PASSDATE.
      *
       LINKAGE SECTION.
      *****************************************************************
      * The following copy file of the pass area for calling CBLDAYB1,
      * the date difference routine.
      *****************************************************************
      *
       COPY CBLDAYB1.
      *
      *****************************************************************
       PROCEDURE DIVISION using DDF-PASS-AREA.
      *
           initialize DDF-JULIAN-DATE-1
           initialize DDF-JULIAN-DATE-2
           initialize DDF-DIFFERENCE-IN-DAYS
      *
           perform DATE-DIFF-1-EDIT
      *
           if  DDF-RESPONSE = 0
               perform DATE-DIFF-2-EDIT
           end-if
      *
           if  DDF-RESPONSE = 0
               if  DDF-JULIAN-DATE-1 > DDF-JULIAN-DATE-2
                   add 20 to ZERO giving DDF-RESPONSE
                   move 'The primary date is > secondary date'
                     to DDF-MESSAGE-TEXT
               end-if
           end-if
      *
           if  DDF-RESPONSE = 0
               perform DATE-DIFF-CALCULATION
           end-if
      *
           GOBACK.
      *
      *****************************************************************
      * The following routines are in alphabetical sequence..         *
      *****************************************************************
      *
      *****************************************************************
       DATE-DIFF-1-EDIT.
           move DDF-GREGORIAN-DATE-1 to STD-GREGORIAN-4-EDIT
           perform DATE-FUNCTION-EDIT
           add STD-RESPONSE to ZERO giving DDF-RESPONSE
           if  STD-RESPONSE = 0
               move SPACES to DDF-MESSAGE-TEXT
               move STD-JULIAN-DATE to DDF-JULIAN-DATE-1
               move STD-DAYS-REMAINING to DDF-DAYS-REMAINING-1
           else
               move STD-MESSAGE-TEXT to DDF-MESSAGE-TEXT
           end-if
           exit.

      *****************************************************************
       DATE-DIFF-2-EDIT.
           move DDF-GREGORIAN-DATE-2 to STD-GREGORIAN-4-EDIT
           perform DATE-FUNCTION-EDIT
           add STD-RESPONSE to ZERO giving DDF-RESPONSE
           if  STD-RESPONSE = 0
               move SPACES to DDF-MESSAGE-TEXT
               move STD-JULIAN-DATE to DDF-JULIAN-DATE-2
               move STD-DAYS-REMAINING to DDF-DAYS-REMAINING-2
           else
               move STD-MESSAGE-TEXT to DDF-MESSAGE-TEXT
           end-if
           exit.
      *
      *****************************************************************
       DATE-DIFF-CALCULATION.
      *    Calculate difference of years...
           subtract DDF-JULIAN-CCYY-1 from DDF-JULIAN-CCYY-2
             giving DIFF-OF-YEARS
      *    Calculate difference of days...
           subtract DIFF-OF-DAYS from DIFF-OF-DAYS
           if  DIFF-OF-YEARS = 0
               subtract DDF-JULIAN-DAY-1 from DDF-JULIAN-DAY-2
                 giving DIFF-OF-DAYS
           else
               add DDF-DAYS-REMAINING-1 to DIFF-OF-DAYS
               add DDF-JULIAN-DAY-2     to DIFF-OF-DAYS
           end-if
      *    Calculate for multiple years ignoring leap years
           if  DIFF-OF-YEARS > 1
               subtract 1 from DIFF-OF-YEARS giving MULTIPLE-YEARS
               multiply 365 by MULTIPLE-YEARS giving REGISTER-7-0
               add REGISTER-7-0 to DIFF-OF-DAYS
           end-if
      *    Adjust difference of days for leap-year cycle...
           if  DIFF-OF-YEARS > 1
               perform DATE-DIFF-CALCULATION-LEAP
               add NUMBER-OF-LEAP-YEARS to DIFF-OF-DAYS
           end-if
           add DIFF-OF-DAYS to ZERO giving DDF-DIFFERENCE-IN-DAYS
           exit.
      *
      *****************************************************************
       DATE-DIFF-CALCULATION-LEAP.
      *    Calculate years to next leap year...
           divide DDF-JULIAN-CCYY-1 by 4 giving MULTIPLE-YEARS
                  remainder HOLD-REMAINDER-1
      *    Calculate number of years between primary and secondary...
           subtract 1 from DIFF-OF-YEARS giving MULTIPLE-YEARS
           add HOLD-REMAINDER-1 to MULTIPLE-YEARS
           divide MULTIPLE-YEARS by 4 giving NUMBER-OF-LEAP-YEARS
      *    Adjust difference of days for 400-year leap-year cycle...
           perform DATE-DIFF-CALCULATION-LEAP-400
           exit.
      *
      *****************************************************************
       DATE-DIFF-CALCULATION-LEAP-400.
      *    Calculate years to next leap year 400 exception...
           divide DDF-JULIAN-CCYY-1 by 400 giving MULTIPLE-YEARS
                  remainder HOLD-REMAINDER-2
      *    Calculate number of years between primary and secondary...
           subtract 1 from DIFF-OF-YEARS giving MULTIPLE-YEARS
           add HOLD-REMAINDER-2 to MULTIPLE-YEARS
           divide MULTIPLE-YEARS by 400 giving REGISTER-7-0
           subtract REGISTER-7-0 from NUMBER-OF-LEAP-YEARS
      *    Adjust difference of days for 4-year leap-year cycle...
           exit.
      *
      *****************************************************************
       DATE-FUNCTION-EDIT.
           move 'EDITDATE'           to STD-REQUEST
           move '-'                  to STD-DATE-EDIT-BYTE
           call 'SIMODATE' using STD-SIMODATE
           exit.
      *
      *****************************************************************
      * The following Z-Routines perform administrative tasks         *
      * for this program.                                             *
      *****************************************************************
      * ABEND the program, post a message to the console and issue    *
      * a STOP RUN.                                                   *
      *****************************************************************
       Z-ABEND-PROGRAM.
           if  MESSAGE-TEXT not = SPACES
               perform Z-DISPLAY-CONSOLE-MESSAGE
           end-if
           move 'PROGRAM-IS-ABENDING...'  to MESSAGE-TEXT
           perform Z-DISPLAY-CONSOLE-MESSAGE
           add 12 to ZERO giving RETURN-CODE
           STOP RUN.
      *    exit.
      *****************************************************************
      * Display CONSOLE messages...                                   *
      *****************************************************************
       Z-DISPLAY-CONSOLE-MESSAGE.
           if MESSAGE-TEXT-2 = SPACES
               display MESSAGE-BUFFER(1:79)
           else
               display MESSAGE-BUFFER
           end-if
           move all SPACES to MESSAGE-TEXT
           exit.
      *****************************************************************
       Z-POST-COPYRIGHT.
           display SIM-TITLE
           display SIM-COPYRIGHT
           exit.
      *****************************************************************
      *      This example is provided by SimoTime Technologies        *
      *        Our e-mail address is: helpdesk@simotime.com           *
      *     Also, visit our Web Site at http://www.simotime.com       *
      *****************************************************************

Table of Contents Previous Section Next Section The Date Validation Routine

The following (SIMODATE.cbl) is the source code listing for the date validation, formatting and conversion routine.

       IDENTIFICATION DIVISION.
       PROGRAM-ID.    SIMODATE.
       AUTHOR.        SIMOTIME TECHNOLOGIES.
      *****************************************************************
      * Copyright (C) 1987-2017 SimoTime Technologies.                *
      *                                                               *
      * All rights reserved.  Unpublished, all rights reserved under  *
      * copyright law and international treaty.  Use of a copyright   *
      * notice is precautionary only and does not imply publication   *
      * or disclosure.                                                *
      *                                                               *
      * Permission to use, copy, modify and distribute this software  *
      * for any non-commercial purpose and without fee is hereby      *
      * granted, provided the SimoTime copyright notice appear on all *
      * copies of the software. The SimoTime name or Logo may not be  *
      * used in any advertising or publicity pertaining to the use    *
      * of the software without the written permission of SimoTime    *
      * Technologies.                                                 *
      *                                                               *
      * Permission to use, copy, modify and distribute this software  *
      * for any commercial purpose requires a fee to be paid to       *
      * SimoTime Technologies. Once the fee is received by SimoTime   *
      * the latest version of the software will be delivered and a    *
      * license will be granted for use within an enterprise,         *
      * provided the SimoTime copyright notice appear on all copies   *
      * of the software. The SimoTime name or Logo may not be used    *
      * in any advertising or publicity pertaining to the use of the  *
      * software without the written permission of SimoTime           *
      * Technologies.                                                 *
      *                                                               *
      * SimoTime Technologies makes no warranty or representations    *
      * about the suitability of the software for any purpose. It is  *
      * provided "AS IS" without any expressed or implied warranty,   *
      * including the implied warranties of merchantability, fitness  *
      * for a particular purpose and non-infringement. SimoTime       *
      * Technologies shall not be liable for any direct, indirect,    *
      * special or consequential damages resulting from the loss of   *
      * use, data or projects, whether in an action of contract or    *
      * tort, arising out of or in connection with the use or         *
      * performance of this software                                  *
      *                                                               *
      * SimoTime Technologies                                         *
      * 15 Carnoustie Drive                                           *
      * Novato, CA 94949-5849                                         *
      * 415.883.6565                                                  *
      *                                                               *
      * RESTRICTED RIGHTS LEGEND                                      *
      * Use, duplication, or disclosure by the Government is subject  *
      * to restrictions as set forth in subparagraph (c)(1)(ii) of    *
      * the Rights in Technical Data and Computer Software clause at  *
      * DFARS 52.227-7013 or subparagraphs (c)(1) and (2) of          *
      * Commercial  Computer Software - Restricted Rights  at 48      *
      * CFR 52.227-19, as applicable.  Contact SimoTime Technologies, *
      * 15 Carnoustie Drive, Novato, CA 94949-5849.                   *
      *                                                               *
      *****************************************************************
      *      This program is provided by SimoTime Technologies        *
      *        Our e-mail address is: helpdesk@simotime.com           *
      *     Also, visit our Web Site at http://www.simotime.com       *
      *                                                               *
      *****************************************************************
      *
      *****************************************************************
      * Source Member: SIMODATE.CBL
      * Copy Files:    PASSDATE.CPY
      *****************************************************************
      *
      * SIMODATE - edits and formats a gregorian date ccyymmdd. It also
      * provides additional information such as:
      *
      * 1. Identify leap year
      * 2. Provide a Julian Date
      * 3. Provide a text date - for example, January 1, 2001
      * 4. Provide days-in-month
      * and more...
      *
      * CALLING PROTOCOL
      * ----------------
      *    call 'SIMODATE' using STD-SIMODATE
      *
      *    01  STD-SIMODATE.
      *        05  STD-REQUEST             pic X(8).
      *        05  STD-RESPONSE            pic 9(4).
      *        05  STD-MESSAGE-TEXT        pic X(68).
      *        05  STD-GREGORIAN-4-EDIT    pic X(10).
      *        05  STD-EDITED-INFO.
      *            10  STD-DEBUG-INFO      pic X(8).
      *            10  STD-LEAP-YEAR-YN    pic X.
      *            10  STD-MONTH-VERBAGE   pic X(10).
      *            10  STD-MM-DAYS         pic 99.
      *            10  STD-GREGORIAN-DATE  pic 9(8).
      *            10  STD-JULIAN-DATE     pic 9(7).
      *            10  STD-JULIAN-VALUE    redefines STD-JULIAN-DATE.
      *                15  STD-JULIAN-CCYY pic 9(4).
      *                15  STD-JULIAN-DAY  pic 9(3).
      *            10  STD-DAYS-REMAINING  pic 9(3).
      *            10  STD-DATE-VERBAGE    pic X(18).
      *            10  STD-DATE-EDIT-BYTE  pic X.
      *            10  STD-DATE-EDITED     pic X(10).
      *
      *****************************************************************
      *
      * MAINTENANCE
      * -----------
      * 1997/02/27 Simmons, Created program.
      * 2004/01/26 Simmons, Mike added the check for 4000th year
      *                     increments are not leap years.
      *
      *****************************************************************
      *
       DATA DIVISION.
       WORKING-STORAGE SECTION.
      *
      *****************************************************************
      *    Data-structure for Title and Copyright...
      *****************************************************************
       01  SIM-TITLE.
           05  T1 pic X(11) value '* SIMODATE '.
           05  T2 pic X(34) value 'Process a Date Request            '.
           05  T3 pic X(10) value ' v13.06.19'.
           05  T4 pic X(24) value ' http://www.simotime.com'.
       01  SIM-COPYRIGHT.
           05  C1 pic X(11) value '* SIMODATE '.
           05  C2 pic X(20) value 'Copyright 1987-2017 '.
           05  C3 pic X(28) value '   SimoTime Technologies    '.
           05  C4 pic X(20) value ' All Rights Reserved'.

      *****************************************************************
       01  FIRST-TIME              pic X       value 'Y'.

       01  IX-1                    pic 999     value 0.
       01  IX-2                    pic 999     value 0.
       01  WORK-N-7                pic 9(7)    value 0.

       01  DATE-WORK-ALPHA.
           05  DATE-WORK-A-CCYY    pic X(4)    value SPACES.
           05  DATE-WORK-A-MM      pic X(2)    value SPACES.
           05  DATE-WORK-A-DD      pic X(2)    value SPACES.

       01  DATE-WORK-NUMERIC.
           05  DATE-WORK-N-CCYY    pic 9(4)    value 0.
           05  DATE-WORK-N-MM      pic 9(2)    value 0.
           05  DATE-WORK-N-DD      pic 9(2)    value 0.

       01  MONTH-TABLE-DATA.
           05  filler              pic X(10)   value 'January   '.
           05  filler              pic X(10)   value 'February  '.
           05  filler              pic X(10)   value 'March     '.
           05  filler              pic X(10)   value 'April     '.
           05  filler              pic X(10)   value 'May       '.
           05  filler              pic X(10)   value 'June      '.
           05  filler              pic X(10)   value 'July      '.
           05  filler              pic X(10)   value 'August    '.
           05  filler              pic X(10)   value 'September '.
           05  filler              pic X(10)   value 'October   '.
           05  filler              pic X(10)   value 'November  '.
           05  filler              pic X(10)   value 'December  '.
           05  filler              pic 99      value 31.
           05  filler              pic 99      value 28.
           05  filler              pic 99      value 31.
           05  filler              pic 99      value 30.
           05  filler              pic 99      value 31.
           05  filler              pic 99      value 30.
           05  filler              pic 99      value 31.
           05  filler              pic 99      value 31.
           05  filler              pic 99      value 30.
           05  filler              pic 99      value 31.
           05  filler              pic 99      value 30.
           05  filler              pic 99      value 31.
       01  MONTH-TABLE             redefines MONTH-TABLE-DATA.
           05  MONTH-VERBAGE       pic X(10)   occurs 12 times.
           05  MONTH-COUNT-OF-DAYS pic 99      occurs 12 times.

       01  JULIAN-DATE.
           05  JULIAN-CCYY         pic 9(4)    value 0.
           05  JULIAN-DDD          pic 9(3)    value 0.

       01  DATE-VERBAGE            pic X(18)   value SPACES.

       01  DAY-OF-WEEK-DATA.
           05  filler              pic X(10)   value 'Sunday    '.
           05  filler              pic X(10)   value 'Monday    '.
           05  filler              pic X(10)   value 'Tuesday   '.
           05  filler              pic X(10)   value 'Wednesday '.
           05  filler              pic X(10)   value 'Thursday  '.
           05  filler              pic X(10)   value 'Friday    '.
           05  filler              pic X(10)   value 'Saturday  '.
       01  DOW-TABLE               redefines DAY-OF-WEEK-DATA.
           05  DOW-VERBAGE         pic X(10)   occurs 7 times.
       01  DOW-IDX                 pic 9       value 0.

      *****************************************************************
       01  MESSAGE-BUFFER.
           05  MESSAGE-HEADER      pic X(11)   value '* SIMODATE '.
           05  MESSAGE-TEXT        pic X(68).

       01  DIFF-OF-YEARS           pic 9(4)    value 0.
       01  DIFF-OF-DAYS            pic 9(7)    value 0.
       01  DIFF-OF-WEEKS           pic 9(7)    value 0.
       01  MULTIPLE-YEARS          pic 9(7)    value 0.
       01  NUMBER-OF-LEAP-YEARS    pic 9(7)    value 0.
       01  HOLD-REMAINDER-1        pic 9(7)    value 0.
       01  HOLD-REMAINDER-2        pic 9(7)    value 0.
       01  REGISTER-7-0            pic 9(7)    value 0.

       COPY PASSDIFF.

      *****************************************************************
       LINKAGE SECTION.
       COPY PASSDATE.

      *****************************************************************
      * Mainline processing routine...
      *****************************************************************
       PROCEDURE DIVISION using STD-SIMODATE.

           add 20 to ZERO giving STD-RESPONSE
           move SPACES to STD-MESSAGE-TEXT

           if  FIRST-TIME not = 'N'
               if  STD-DEBUG-INFO = 'DEBUG   '
               or  STD-DEBUG-INFO = 'TRACE   '
                   perform Z-POST-COPYRIGHT
               end-if
               move 'N' to FIRST-TIME
           end-if

           evaluate STD-REQUEST
               when 'EDITDATE' perform EDIT-DATE-FUNCTION
               when 'EDITGDAT' perform ACTION-GDAT-REQUEST
               when OTHER      add 16 to ZERO giving RETURN-CODE
                               move '0016' to STD-RESPONSE
           end-evaluate

           if  STD-RESPONSE = 20
           and STD-MESSAGE-TEXT = SPACES
               subtract STD-RESPONSE from STD-RESPONSE
           end-if

           GOBACK.

      *****************************************************************
      *    This routine will accept dates in the following formats
      *     ccyymmdd
      *      ccyy/mm/dd
      *      ccyy-mm-dd
      *      ccyy.mm.dd
      *****************************************************************
       ACTION-GDAT-REQUEST.
           move SPACES to DATE-WORK-ALPHA
           add 1 to ZERO giving IX-2
           move STD-GREGORIAN-4-EDIT to DATE-WORK-A-CCYY
           if  DATE-WORK-A-CCYY not NUMERIC
               move 'NOK for Date Value, CCYY not numeric value...'
                 to MESSAGE-TEXT
               perform Z-POST-ABEND
           else
               add 4 to IX-2
           end-if
      *    --------------------------------------------------------
      *    Possible non-numeric separator between CCYY and MM
           if  STD-GREGORIAN-4-EDIT(IX-2:1) not NUMERIC
               add 1 to IX-2
           end-if
           move STD-GREGORIAN-4-EDIT(IX-2:2) to DATE-WORK-A-MM
           if  DATE-WORK-A-MM not NUMERIC
               move DATE-WORK-A-MM(1:1) to DATE-WORK-A-MM(2:1)
               move ZERO                to DATE-WORK-A-MM(1:1)
               add 1 to IX-2
           else
               add 2 to IX-2
           end-if
      *    --------------------------------------------------------
      *    Possible non-numeric separator between MM and DD
           if  STD-GREGORIAN-4-EDIT(IX-2:1) not NUMERIC
               add 1 to IX-2
           end-if
           move STD-GREGORIAN-4-EDIT(IX-2:2) to DATE-WORK-A-DD
           if  DATE-WORK-A-DD not NUMERIC
               move DATE-WORK-A-DD(1:1) to DATE-WORK-A-DD(2:1)
               move ZERO                to DATE-WORK-A-DD(1:1)
           end-if
           if  DATE-WORK-A-MM not NUMERIC
               move 'NOK for Date Value, MM not numeric value...'
                 to MESSAGE-TEXT
               perform Z-POST-ABEND
           end-if
           if  DATE-WORK-A-DD not NUMERIC
               move 'NOK for Date Value, DD not numeric value...'
                 to MESSAGE-TEXT
               perform Z-POST-ABEND
           end-if
           move 'WIP for Date Function...' to MESSAGE-TEXT
           perform Z-POST-CONDITIONAL-TRACE
           move DATE-WORK-ALPHA to DATE-WORK-NUMERIC
           perform FUNCTION-LEAP-YEAR.

           perform FUNCTION-FOR-MONTH
           perform FUNCTION-FOR-DAY
           perform FUNCTION-CREATE-TXT-DATE
           perform FUNCTION-CREATE-NBR-DATE
           perform FUNCTION-CONVERT-GDATE-2-JDATE
           perform FUNCTION-CALCULATE-DAYS-LEFT

           perform FUNCTION-DAY-OF-WEEK

      *    ------------------------------------------------------------
      *    Determine AOK for Date Message...
           move 'AOK for Date Function...' to MESSAGE-TEXT
           perform Z-POST-CONDITIONAL-TRACE

           exit.

      *****************************************************************
      *>   This routine will accept dates in the following formats
      *>     ccyymmdd
      *>     ccyy/mm/dd
      *>     ccyy-mm-dd
      *>     ccyy.mm.dd
      *****************************************************************
       EDIT-DATE-FUNCTION.
           move SPACES to DATE-WORK-ALPHA
           add 1 to ZERO giving IX-2
           move STD-GREGORIAN-4-EDIT to DATE-WORK-A-CCYY
           if  DATE-WORK-A-CCYY not NUMERIC
               move 'NOK for Date Value, CCYY not numeric value...'
                 to MESSAGE-TEXT
               perform Z-POST-ABEND
           else
               add 4 to IX-2
           end-if
      *>   --------------------------------------------------------
      *>   Possible non-numeric separator between CCYY and MM
           if  STD-GREGORIAN-4-EDIT(IX-2:1) not NUMERIC
               add 1 to IX-2
           end-if
           move STD-GREGORIAN-4-EDIT(IX-2:2) to DATE-WORK-A-MM
           if  DATE-WORK-A-MM not NUMERIC
               move DATE-WORK-A-MM(1:1) to DATE-WORK-A-MM(2:1)
               move ZERO                to DATE-WORK-A-MM(1:1)
               add 1 to IX-2
           else
               add 2 to IX-2
           end-if
      *>   --------------------------------------------------------
      *>   Possible non-numeric separator between MM and DD
           if  STD-GREGORIAN-4-EDIT(IX-2:1) not NUMERIC
               add 1 to IX-2
           end-if
           move STD-GREGORIAN-4-EDIT(IX-2:2) to DATE-WORK-A-DD
           if  DATE-WORK-A-DD not NUMERIC
               move DATE-WORK-A-DD(1:1) to DATE-WORK-A-DD(2:1)
               move ZERO                to DATE-WORK-A-DD(1:1)
           end-if
           if  DATE-WORK-A-MM not NUMERIC
               move 'NOK for Date Value, MM not numeric value...'
                 to MESSAGE-TEXT
               perform Z-POST-ABEND
           end-if
           if  DATE-WORK-A-DD not NUMERIC
               move 'NOK for Date Value, DD not numeric value...'
                 to MESSAGE-TEXT
               perform Z-POST-ABEND
           end-if
           move 'WIP for Date Function...' to MESSAGE-TEXT
           perform Z-POST-CONDITIONAL-TRACE
           move DATE-WORK-ALPHA to DATE-WORK-NUMERIC
      *   ------------------------------------------------------------
      *   Determine if a leap year, it is not true that every fourth
      *   year is a leap year.
      *
      *   if CCYY is divisible by 4 it is a  leap year
      *      except
      *      if divisible by 100 then it is not a leap year
      *         except
      *         if divisible by 400 then it is a leap year
      *            except
      *            if divisible by 4000 then it is not a leap year.
      *
      *    1600,2000, etc... are leap years
      *    1700,1800,1900 are not leap years
      *    4000,8000,etc... are not leap years
      *
      *    In other words the 100th year increments are not leap
      *    years with the exception that every 400th year increment
      *    is a leap year except every 4000th year is not a leap year.
      *
           move 'N' to STD-LEAP-YEAR-YN
           add 28 to ZERO giving MONTH-COUNT-OF-DAYS(2)
           move 'WIP for Date, not a Leap Year...' to MESSAGE-TEXT
           divide DATE-WORK-N-CCYY by 4 giving WORK-N-7
           multiply 4 by WORK-N-7
           if  WORK-N-7 = DATE-WORK-N-CCYY
               divide DATE-WORK-N-CCYY by 100 giving WORK-N-7
               multiply 100 by WORK-N-7
               if  WORK-N-7  = DATE-WORK-N-CCYY
                   divide DATE-WORK-N-CCYY by 400 giving WORK-N-7
                   multiply 400 by WORK-N-7
                   if  WORK-N-7 = DATE-WORK-N-CCYY
                       divide DATE-WORK-N-CCYY by 4000 giving WORK-N-7
                       multiply 4000 by WORK-N-7
                       if  WORK-N-7 not = DATE-WORK-N-CCYY
                           move 'Y' to STD-LEAP-YEAR-YN
                       end-if
                   end-if
               else
                   move 'Y' to STD-LEAP-YEAR-YN
               end-if
               if  STD-LEAP-YEAR-YN = 'Y'
                   move 'Y' to STD-LEAP-YEAR-YN
                   add 29 to ZERO giving MONTH-COUNT-OF-DAYS(2)
                   move 'WIP for Date, it is a Leap Year...'
                     to MESSAGE-TEXT
               end-if
           end-if
           perform Z-POST-CONDITIONAL-TRACE
      *>   ------------------------------------------------------------
      *>   Test for a valid month...
           if  DATE-WORK-N-MM > 0
           and DATE-WORK-N-MM < 13
               move 'WIP for Date, month is ?????????' to MESSAGE-TEXT
               move MONTH-VERBAGE(DATE-WORK-N-MM)
                 to MESSAGE-TEXT(24:10)
               perform Z-POST-CONDITIONAL-TRACE
               move MONTH-VERBAGE(DATE-WORK-N-MM)
                 to MESSAGE-TEXT(24:10)
               move MONTH-VERBAGE(DATE-WORK-N-MM) to STD-MONTH-VERBAGE
           else
               move 'NOK for Date Value, MM not 1 through 12...'
                 to MESSAGE-TEXT
               perform Z-POST-ABEND

           end-if
      *>   ------------------------------------------------------------
      *>   Test for a valid day...
           if  DATE-WORK-N-DD > 0
           and DATE-WORK-N-DD < MONTH-COUNT-OF-DAYS(DATE-WORK-N-MM) + 1
               move 'WIP for Date, month has ?? days' to MESSAGE-TEXT
               move MONTH-COUNT-OF-DAYS(DATE-WORK-N-MM)
                 to MESSAGE-TEXT(25:2)
               perform Z-POST-CONDITIONAL-TRACE
           else
               move 'NOK for Day Value, DD not within month range...'
                 to MESSAGE-TEXT
               perform Z-POST-ABEND
           end-if
           move MONTH-COUNT-OF-DAYS(DATE-WORK-N-MM)
             to STD-MM-DAYS

      *>   ------------------------------------------------------------
      *>   Create text version of the date. This is a sixteen character
      *>   field (DATE-VERBAGE) that is left-justified in the following
      *>   format...      month dd, ccyy
           move 'WIP for Date, ' to MESSAGE-TEXT
           move MONTH-VERBAGE(DATE-WORK-N-MM) to DATE-VERBAGE
           subtract IX-2 from IX-2
           inspect DATE-VERBAGE tallying IX-2
                   for CHARACTERS before SPACE
           add 2 to IX-2
           if  DATE-WORK-A-DD(1:1) = '0'
               move DATE-WORK-A-DD(2:1) to DATE-VERBAGE(IX-2:1)
               add 1 to IX-2
           else
               move DATE-WORK-A-DD to DATE-VERBAGE(IX-2:2)
               add 2 to IX-2
           end-if
           move ', ' to DATE-VERBAGE(IX-2:2)
           add 2 to IX-2
           move DATE-WORK-N-CCYY to DATE-VERBAGE(IX-2:4)

           move DATE-VERBAGE to MESSAGE-TEXT(15:18)
           perform Z-POST-CONDITIONAL-TRACE

           move DATE-VERBAGE to STD-DATE-VERBAGE

      *>   ------------------------------------------------------------
      *>   Create numeric date for display or print...
           move DATE-WORK-A-CCYY   to STD-DATE-EDITED
           move STD-DATE-EDIT-BYTE to STD-DATE-EDITED(5:1)
           move DATE-WORK-A-MM     to STD-DATE-EDITED(6:2)
           move STD-DATE-EDIT-BYTE to STD-DATE-EDITED(8:1)
           move DATE-WORK-A-DD     to STD-DATE-EDITED(9:2)
           move DATE-WORK-NUMERIC  to STD-GREGORIAN-DATE

      *>   ------------------------------------------------------------
      *>   Determine Julian Date...
           move 'WIP for Date, Julian is CCYYDDD' to MESSAGE-TEXT
           move DATE-WORK-N-CCYY to JULIAN-CCYY
           add DATE-WORK-N-DD to ZERO giving JULIAN-DDD
           add 1 to ZERO giving IX-2
           perform until IX-2 = DATE-WORK-N-MM
                      or IX-2 > 12
               add MONTH-COUNT-OF-DAYS(IX-2) to JULIAN-DDD
               add 1 to IX-2
           end-perform
           move JULIAN-DATE to MESSAGE-TEXT(25:7)
           perform Z-POST-CONDITIONAL-TRACE
           move JULIAN-DATE to STD-JULIAN-DATE

      *>   ------------------------------------------------------------
      *>   Calculate remaining days in the year...
           if  STD-LEAP-YEAR-YN = 'Y'
               subtract STD-JULIAN-DAY from 366
                 giving STD-DAYS-REMAINING
           else
               subtract STD-JULIAN-DAY from 365
                 giving STD-DAYS-REMAINING
           end-if

      *>   ------------------------------------------------------------
      *>   Determine AOK for Date Message...
           move 'AOK for Date Function...' to MESSAGE-TEXT
           perform Z-POST-CONDITIONAL-TRACE
           exit.

      *****************************************************************
       FUNCTION-CREATE-TXT-DATE.
      *    ------------------------------------------------------------
      *    Create text version of the date. This is a sixteen character
      *    field (DATE-VERBAGE) that is left-justified in the following
      *    format...      month dd, ccyy
           move 'WIP for Date, ' to MESSAGE-TEXT
           move MONTH-VERBAGE(DATE-WORK-N-MM) to DATE-VERBAGE
           subtract IX-2 from IX-2
           inspect DATE-VERBAGE tallying IX-2
                   for CHARACTERS before SPACE
           add 2 to IX-2
           if  DATE-WORK-A-DD(1:1) = '0'
               move DATE-WORK-A-DD(2:1) to DATE-VERBAGE(IX-2:1)
               add 1 to IX-2
           else
               move DATE-WORK-A-DD to DATE-VERBAGE(IX-2:2)
               add 2 to IX-2
           end-if
           move ', ' to DATE-VERBAGE(IX-2:2)
           add 2 to IX-2
           move DATE-WORK-N-CCYY to DATE-VERBAGE(IX-2:4)

           move DATE-VERBAGE to MESSAGE-TEXT(15:18)
           perform Z-POST-CONDITIONAL-TRACE

           move DATE-VERBAGE to STD-DATE-VERBAGE
           exit.

      *****************************************************************
       FUNCTION-DAY-OF-WEEK.
      *    Determine the Day of a week as a number and text.
      *   ----------------------------------------------------------- *
           move ZERO to STD-DAY-OF-WEEK-NBR
           move 'Unknown   ' to STD-DAY-OF-WEEK-TXT
           add 1600001 to ZERO giving DDF-JULIAN-DATE-1
           move STD-JULIAN-DATE to DDF-JULIAN-DATE-2
           perform FUNCTION-DATE-DIFFERENCE
           divide DDF-DIFFERENCE-IN-DAYS by 7
           giving DIFF-OF-WEEKS remainder DOW-IDX
           evaluate DOW-IDX
             when 0     add 6 to ZERO giving STD-DAY-OF-WEEK-NBR
             when 1     add 7 to ZERO giving STD-DAY-OF-WEEK-NBR
             when 2     add 1 to ZERO giving STD-DAY-OF-WEEK-NBR
             when 3     add 2 to ZERO giving STD-DAY-OF-WEEK-NBR
             when 4     add 3 to ZERO giving STD-DAY-OF-WEEK-NBR
             when 5     add 4 to ZERO giving STD-DAY-OF-WEEK-NBR
             when 6     add 5 to ZERO giving STD-DAY-OF-WEEK-NBR
           end-evaluate
           if  STD-DAY-OF-WEEK-NBR > 0
           and STD-DAY-OF-WEEK-NBR < 8
               move DOW-VERBAGE(STD-DAY-OF-WEEK-NBR)
                 to STD-DAY-OF-WEEK-TXT
           else
               move ZERO to STD-DAY-OF-WEEK-NBR
               move 'Unknown   ' to STD-DAY-OF-WEEK-TXT
           end-if
           exit.

      *****************************************************************
       FUNCTION-LEAP-YEAR.
      *   ----------------------------------------------------------- *
      *   Determine if a leap year, it is not true that every fourth
      *   year is a leap year.
      *
      *   if CCYY is divisible by 4 it is a  leap year
      *      except
      *      if divisible by 100 then it is not a leap year
      *         except
      *         if divisible by 400 then it is a leap year
      *            except
      *            if divisible by 4000 then it is not a leap year.
      *
      *    1600,2000, etc... are leap years
      *    1700,1800,1900 are not leap years
      *    4000,8000,etc... are not leap years
      *
      *    In other words the 100th year increments are not leap
      *    years with the exception that every 400th year increment
      *    is a leap year except every 4000th year is not a leap year.
      *
           move 'N' to STD-LEAP-YEAR-YN
           add 28 to ZERO giving MONTH-COUNT-OF-DAYS(2)
           move 'WIP for Date, not a Leap Year...' to MESSAGE-TEXT
           divide DATE-WORK-N-CCYY by 4 giving WORK-N-7
           multiply 4 by WORK-N-7
           if  WORK-N-7 = DATE-WORK-N-CCYY
               divide DATE-WORK-N-CCYY by 100 giving WORK-N-7
               multiply 100 by WORK-N-7
               if  WORK-N-7  = DATE-WORK-N-CCYY
                   divide DATE-WORK-N-CCYY by 400 giving WORK-N-7
                   multiply 400 by WORK-N-7
                   if  WORK-N-7 = DATE-WORK-N-CCYY
                       divide DATE-WORK-N-CCYY by 4000 giving WORK-N-7
                       multiply 4000 by WORK-N-7
                       if  WORK-N-7 not = DATE-WORK-N-CCYY
                           move 'Y' to STD-LEAP-YEAR-YN
                       end-if
                   end-if
               else
                   move 'Y' to STD-LEAP-YEAR-YN
               end-if
               if  STD-LEAP-YEAR-YN = 'Y'
                   move 'Y' to STD-LEAP-YEAR-YN
                   add 29 to ZERO giving MONTH-COUNT-OF-DAYS(2)
                   move 'WIP for Date, it is a Leap Year...'
                     to MESSAGE-TEXT
               end-if
           end-if
           perform Z-POST-CONDITIONAL-TRACE

           exit.

      *****************************************************************
       FUNCTION-FOR-MONTH.
      *    ------------------------------------------------------------
      *    Test for a valid month...
           if  DATE-WORK-N-MM > 0
           and DATE-WORK-N-MM < 13
               move 'WIP for Date, month is ?????????' to MESSAGE-TEXT
               move MONTH-VERBAGE(DATE-WORK-N-MM)
                 to MESSAGE-TEXT(24:10)
               perform Z-POST-CONDITIONAL-TRACE
               move MONTH-VERBAGE(DATE-WORK-N-MM)
                 to MESSAGE-TEXT(24:10)
               move MONTH-VERBAGE(DATE-WORK-N-MM) to STD-MONTH-VERBAGE
           else
               move 'NOK for Date Value, MM not 1 through 12...'
                 to MESSAGE-TEXT
               perform Z-POST-ABEND

           end-if
           exit.

      *****************************************************************
       FUNCTION-FOR-DAY.
      *    ------------------------------------------------------------
      *    Test for a valid day...
           if  DATE-WORK-N-DD > 0
           and DATE-WORK-N-DD < MONTH-COUNT-OF-DAYS(DATE-WORK-N-MM) + 1
               move 'WIP for Date, month has ?? days' to MESSAGE-TEXT
               move MONTH-COUNT-OF-DAYS(DATE-WORK-N-MM)
                 to MESSAGE-TEXT(25:2)
               perform Z-POST-CONDITIONAL-TRACE
           else
               move 'NOK for Day Value, DD not within month range...'
                 to MESSAGE-TEXT
               perform Z-POST-ABEND
           end-if
           move MONTH-COUNT-OF-DAYS(DATE-WORK-N-MM)
             to STD-MM-DAYS
           exit.

      *****************************************************************
       FUNCTION-CREATE-NBR-DATE.
      *    ------------------------------------------------------------
      *    Create numeric date for display or print...
           move DATE-WORK-A-CCYY   to STD-DATE-EDITED
           move STD-DATE-EDIT-BYTE to STD-DATE-EDITED(5:1)
           move DATE-WORK-A-MM     to STD-DATE-EDITED(6:2)
           move STD-DATE-EDIT-BYTE to STD-DATE-EDITED(8:1)
           move DATE-WORK-A-DD     to STD-DATE-EDITED(9:2)
           move DATE-WORK-NUMERIC  to STD-GREGORIAN-DATE
           exit.

      *****************************************************************
       FUNCTION-CONVERT-GDATE-2-JDATE.
      *    ------------------------------------------------------------
      *    Determine Julian Date...
           move 'WIP for Date, Julian is CCYYDDD' to MESSAGE-TEXT
           move DATE-WORK-N-CCYY to JULIAN-CCYY
           add DATE-WORK-N-DD to ZERO giving JULIAN-DDD
           add 1 to ZERO giving IX-2
           perform until IX-2 = DATE-WORK-N-MM
                      or IX-2 > 12
               add MONTH-COUNT-OF-DAYS(IX-2) to JULIAN-DDD
               add 1 to IX-2
           end-perform
           move JULIAN-DATE to MESSAGE-TEXT(25:7)
           perform Z-POST-CONDITIONAL-TRACE
           move JULIAN-DATE to STD-JULIAN-DATE
           exit.

      *****************************************************************
       FUNCTION-CALCULATE-DAYS-LEFT.
      *    ------------------------------------------------------------
      *    Calculate remaining days in the year...
           if  STD-LEAP-YEAR-YN = 'Y'
               subtract STD-JULIAN-DAY from 366
                 giving STD-DAYS-REMAINING
           else
               subtract STD-JULIAN-DAY from 365
                 giving STD-DAYS-REMAINING
           end-if
           exit.



      *****************************************************************
       FUNCTION-DATE-DIFFERENCE.
      *    Calculate difference of years...
           subtract DDF-JULIAN-CCYY-1 from DDF-JULIAN-CCYY-2
             giving DIFF-OF-YEARS
      *    Calculate difference of days...
           subtract DIFF-OF-DAYS from DIFF-OF-DAYS
           if  DIFF-OF-YEARS = 0
               subtract DDF-JULIAN-DAY-1 from DDF-JULIAN-DAY-2
                 giving DIFF-OF-DAYS
           else
               add DDF-DAYS-REMAINING-1 to DIFF-OF-DAYS
               add DDF-JULIAN-DAY-2     to DIFF-OF-DAYS
           end-if
      *    Calculate for multiple years ignoring leap years
           if  DIFF-OF-YEARS > 1
               subtract 1 from DIFF-OF-YEARS giving MULTIPLE-YEARS
               multiply 365 by MULTIPLE-YEARS giving REGISTER-7-0
               add REGISTER-7-0 to DIFF-OF-DAYS
           end-if
      *    Adjust difference of days for leap-year cycle...
           if  DIFF-OF-YEARS > 1
               perform FUNCTION-DATE-DIFF-LEAP
               add NUMBER-OF-LEAP-YEARS to DIFF-OF-DAYS
           end-if
           add DIFF-OF-DAYS to ZERO giving DDF-DIFFERENCE-IN-DAYS
           exit.

      *****************************************************************
       FUNCTION-DATE-DIFF-LEAP.
      *    Calculate years to next leap year...
           divide DDF-JULIAN-CCYY-1 by 4 giving MULTIPLE-YEARS
                  remainder HOLD-REMAINDER-1
      *    Calculate number of years between primary and secondary...
           subtract 1 from DIFF-OF-YEARS giving MULTIPLE-YEARS
           add HOLD-REMAINDER-1 to MULTIPLE-YEARS
           divide MULTIPLE-YEARS by 4 giving NUMBER-OF-LEAP-YEARS
      *    Adjust difference of days for 400-year leap-year cycle...
           perform FUNCTION-DATE-DIFF-LEAP-400
           exit.

      *****************************************************************
       FUNCTION-DATE-DIFF-LEAP-400.
      *    Calculate years to next leap year 400 exception...
           divide DDF-JULIAN-CCYY-1 by 400 giving MULTIPLE-YEARS
                  remainder HOLD-REMAINDER-2
      *    Calculate number of years between primary and secondary...
           subtract 1 from DIFF-OF-YEARS giving MULTIPLE-YEARS
           add HOLD-REMAINDER-2 to MULTIPLE-YEARS
           divide MULTIPLE-YEARS by 400 giving REGISTER-7-0
           subtract REGISTER-7-0 from NUMBER-OF-LEAP-YEARS
      *    Adjust difference of days for 4-year leap-year cycle...
           exit.




      *****************************************************************
      *    Display Copyright or Program Message...
      *    ------------------------------------------------------------
       Z-POST-ABEND.
           if  MESSAGE-TEXT not = SPACES
               move MESSAGE-TEXT to STD-MESSAGE-TEXT
               perform Z-POST-MESSAGE
           end-if
           move 'Program is ABENDING...' to MESSAGE-TEXT
           perform Z-POST-MESSAGE
           perform Z-POST-CONSOLE
           add 16 to ZERO giving STD-RESPONSE
           GOBACK.

       Z-POST-COPYRIGHT.
           display SIM-TITLE     upon console
           display SIM-COPYRIGHT upon console
           exit.

       Z-POST-CONSOLE.
           display MESSAGE-BUFFER upon console
           exit.

       Z-POST-MESSAGE.
           display MESSAGE-BUFFER upon console
           move SPACES to MESSAGE-TEXT
           exit.

       Z-POST-CONDITIONAL-TRACE.
           if  STD-DEBUG-INFO = 'DEBUG   '
           or  STD-DEBUG-INFO = 'TRACE   '
               display MESSAGE-BUFFER upon console
           end-if
           move SPACES to MESSAGE-TEXT
           exit.
      *****************************************************************
      *      This example is provided by SimoTime Technologies        *
      *        Our e-mail address is: helpdesk@simotime.com           *
      *     Also, visit our Web Site at http://www.simotime.com       *
      *****************************************************************

Table of Contents Previous Section Next Section Summary

This suite of programs provides an example of a techniques that may be used to calculate the number-of-days difference between two Gregorian dates in the ccyymmdd format. This document may be used to assist as a tutorial for new programmers or as a quick reference for experienced programmers.

In the world of programming there are many ways to solve a problem. This document and the links to other documents are intended to provide a greater awareness of the Data Management and Application Processing alternatives.

The documentation and software were developed and tested on systems that are configured for a SIMOTIME environment based on the hardware, operating systems, user requirements and security requirements. Therefore, adjustments may be needed to execute the jobs and programs when transferred to a system of a different architecture or configuration.

SIMOTIME Services has experience in moving or sharing data or application processing across a variety of systems. For additional information about SIMOTIME Services or Technologies please send an e-mail to: helpdesk@simotime.com or call 415 883-6565. We appreciate hearing from you.

Table of Contents Previous Section Next Section Software Agreement and Disclaimer

Permission to use, copy, modify and distribute this software, documentation or training material for any purpose requires a fee to be paid to SimoTime Technologies. Once the fee is received by SimoTime the latest version of the software, documentation or training material will be delivered and a license will be granted for use within an enterprise, provided the SimoTime copyright notice appear on all copies of the software. The SimoTime name or Logo may not be used in any advertising or publicity pertaining to the use of the software without the written permission of SimoTime Technologies.

SimoTime Technologies makes no warranty or representations about the suitability of the software, documentation or learning material for any purpose. It is provided "AS IS" without any expressed or implied warranty, including the implied warranties of merchantability, fitness for a particular purpose and non-infringement. SimoTime Technologies shall not be liable for any direct, indirect, special or consequential damages resulting from the loss of use, data or projects, whether in an action of contract or tort, arising out of or in connection with the use or performance of this software, documentation or training material.

Table of Contents Previous Section Next Section Downloads and Links

This section includes links to documents with additional information that are beyond the scope and purpose of this document. The first group of documents may be available from a local system or via an internet connection, the second group of documents will require an internet connection.

Note: A SimoTime License is required for the items to be made available on a local system or server.

Table of Contents Previous Section Next Section Current Server or Internet Access

The following links may be to the current server or to the Internet.

Note: The latest versions of the SimoTime Documents and Program Suites are available on the Internet and may be accessed using the Link to Internet icon. If a user has a SimoTime Enterprise License the Documents and Program Suites may be available on a local server and accessed using the Link to Server icon.

Link to Internet   Link to Server   Explore Date Edit, Validate, Format or Convert functionality using COBOL.

Link to Internet   Link to Server   Explore the JCL Connection for more examples of JCL functionality with programming techniques and sample code.

Link to Internet   Link to Server   Explore the COBOL Connection for more examples of COBOL programming techniques and sample code.

Link to Internet   Link to Server   Explore An Enterprise System Model that describes and demonstrates how Applications that were running on a Mainframe System and non-relational data that was located on the Mainframe System were copied and deployed in a Microsoft Windows environment with Micro Focus Enterprise Server.

Link to Internet   Link to Server   Explore The ASCII and EBCDIC Translation Tables. These tables are provided for individuals that need to better understand the bit structures and differences of the encoding formats.

Link to Internet   Link to Server   Explore The File Status Return Codes to interpret the results of accessing VSAM data sets and/or QSAM files.

Table of Contents Previous Section Next Section Internet Access Required

The following links will require an internet connect.

This suite of programs and documentation is available to download for review and evaluation purposes. Other uses will require a SimoTime Software License. Link to an Evaluation zPAK Option that includes the program members, documentation and control files.

A good place to start is The SimoTime Home Page for access to white papers, program examples and product information. This link requires an Internet Connection

Explore The Micro Focus Web Site for more information about products and services available from Micro Focus. This link requires an Internet Connection.

Table of Contents Previous Section Next Section Glossary of Terms

Link to Internet   Link to Server   Explore the Glossary of Terms for a list of terms and definitions used in this suite of documents and white papers.

Table of Contents Previous Section Next Section Comments or Feedback

This document was created and is copyrighted and maintained by SimoTime Technologies.

If you have any questions, suggestions, comments or feedback please call or send an e-mail to: helpdesk@simotime.com

We appreciate hearing from you.

Table of Contents Previous Section Next Section Company Overview

SimoTime Technologies was founded in 1987 and is a privately owned company. We specialize in the creation and deployment of business applications using new or existing technologies and services. We have a team of individuals that understand the broad range of technologies being used in today's environments. Our customers include small businesses using Internet technologies to corporations using very large mainframe systems.

Quite often, to reach larger markets or provide a higher level of service to existing customers it requires the newer Internet technologies to work in a complementary manner with existing corporate mainframe systems. We specialize in preparing applications and the associated data that are currently residing on a single platform to be distributed across a variety of platforms.

Preparing the application programs will require the transfer of source members that will be compiled and deployed on the target platform. The data will need to be transferred between the systems and may need to be converted and validated at various stages within the process. SimoTime has the technology, services and experience to assist in the application and data management tasks involved with doing business in a multi-system environment.

Whether you want to use the Internet to expand into new market segments or as a delivery vehicle for existing business functions or need assistance with converting non-relational data structures simply give us a call at 415 883-6565 or check the web site at http://www.simotime.com


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Date Processing Example, Difference in Dates by Days
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