1. Date Conversion Program
No speaker notes - comments embedded in program!

2. IDENTIFICATION DIVISION.
PROGRAM-ID. STRINGG.
ENVIRONMENT DIVISION.
DATA DIVISION.
WORKING-STORAGE SECTION.
01 DATE1.
05 YR1 PIC 99 VALUE 0.
05 MO1 PIC 99 VALUE 0.
05 DA1 PIC 99 VALUE 0.
01 DATE2.
05 YR2 PIC 99 VALUE 0.
05 MO2 PIC 99 VALUE 0.
05 DA2 PIC 99 VALUE 0.
01 JULIAN1.
05 JYR1 PIC 99.
05 JDA1 PIC 999.
01 JULIAN2.
05 JYR2 PIC 99.
05 JDA2 PIC 999.
01 DAYS1 PIC 9(5) VALUE 0.
01 DAYS2 PIC 9(5) VALUE 0.
01 ANS1 PIC 9(5) VALUE 0.
01 ANS2 PIC 9(5) VALUE 0.
01 JUNK-ANS PIC 9(5) VALUE 0.
01 REM-WS1 PIC 9(5) VALUE 0.
01 REM-WS2 PIC 9(5) VALUE 0.
01 REM-YR PIC 9(5) VALUE 0.
01 YRS-DAYS PIC 9(5) VALUE 0.
01 YR-DIFF PIC 9(5) VALUE 0.
01 DAYS-ANSWER PIC 9(6) VALUE 0.
01 DO-ANS PIC X VALUE "Y".
Convdate.cbl
01 DATE-PASSED.
05 FILLER PIC VALUE 000.
05 FILLER PIC VALUE 031.
05 FILLER PIC VALUE 059.
05 FILLER PIC VALUE 090.
05 FILLER PIC VALUE 120.
05 FILLER PIC VALUE 151.
05 FILLER PIC VALUE 181.
05 FILLER PIC VALUE 212.
05 FILLER PIC VALUE 243.
05 FILLER PIC VALUE 273.
05 FILLER PIC VALUE 304.
05 FILLER PIC VALUE 334.
01 RDF-DATE-PASSED REDEFINES DATE-PASSED.
05 DAYS-PASSED PIC 999 OCCURS 12 TIMES.

3. PROCEDURE DIVISION. Using 2 dates 000102 and 991231 MAINLINE.
PERFORM B-100-DATE-DIFF
UNTIL DO-ANS = "N".
STOP RUN.
B-100-DATE-DIFF.
DISPLAY "ROUTINE TO SUBTRACT SECOND DATE FROM FIRST DATE".
DISPLAY "ENTER FIRST DATE - YYMMDD"
(YR1=00 MO1=01 DA1=02)
ACCEPT DATE1.
DISPLAY "ENTER SECOND DATE - YYMMDD"
(YR2=99 MO2=12 DA2=31)
ACCEPT DATE2.
PERFORM B-200-CONVERT-1.
PERFORM B-210-CONVERT-2.
IF YR1 = YR NOT EQUAL
SUBTRACT JDA2 FROM JDA1
GIVING DAYS-ANSWER
DISPLAY "NO YEAR TO CONVERT"
DISPLAY "DAYS BETWEEN " DAYS-ANSWER
ELSE
DISPLAY "GOING TO CONVERT YEAR" GOING TO CONVERT YEAR
PERFORM B-220-CONVERT-YEAR
DISPLAY "DAYS BETWEEN " YRS-DAYS.
DAYS BETWEEN 00002
DISPLAY "ANOTHER DATE Y OR N?".
ACCEPT DO-ANS.

4. Using 2 dates 000102 and 991231 B-200-CONVERT-1. DIVIDE YR1 BY 4
GIVING JUNK-ANS REMAINDER REM-WS1. 00/4=0 REM-WS1=0
MOVE YR1 TO JYR JYR1=00
ADD DAYS-PASSED (MO1) DA1
GIVING JDA JDA1= = 002
IF REM-WS1 = 0 AND MO1 > 2
ADD 1 TO JDA1.
DISPLAY "FIRST DATE IN JULIAN " JDA1.
FIRST DATE IN JULIAN 002
B-210-CONVERT-2.
DIVIDE YR2 BY 4
GIVING JUNK-ANS REMAINDER REM-WS2. 99/4= 24 REM-WS2=3
MOVE YR2 TO JYR JYR2=99
ADD DAYS-PASSED (MO2) DA2
GIVING JDA JDA2= = 365
IF REM-WS2 = 0 AND MO2 > 2
ADD 1 TO JDA2.
DISPLAY "SECOND DATE IN JULIAN " JDA2.
SECOND DATE IN JULIAN 365

5. Using 2 dates 000102 and 991231 B-220-CONVERT-YEAR.
DISPLAY "IN CONVERT YEAR" IN CONVERT YEAR
IF REM-WS2 = 0
SUBTRACT JDA2 FROM 366
GIVING YRS-DAYS
ELSE
SUBTRACT JDA2 FROM 365
GIVING YRS-DAYS YRS-DAYS= = 00000
DISPLAY "YRS-DAYS WITH JDA2 " YRS-DAYS.
YRS-DAYS WITH JDA
ADD JDA1 TO YRS-DAYS.
YRS-DAYS = = 00002
DISPLAY "YRS-DAYS AFTER JDA1 ADDDED " YRS-DAYS.
YRS-DAYS AFTER JDA1 ADDED 00002
SUBTRACT YR2 FROM YR1
GIVING YR-DIFF YR-DIFF = = 00099
DISPLAY "YR-DIFF " YR-DIFF.
YR-DIFF 00099
IF YR-DIFF > 1
ADD 1 TO YR YR2 = = 100 = 00
(stored in 2 char field as 00)
DISPLAY "YR-DIFF > 1 YR2 IS " YR2 YRDIFF > 1 YR2 IS 00
PERFORM B-300-ADD-A-YEAR
UNTIL YR2 = YR1. Until 00 = 00 so no perform done
B-300-ADD-A-YEAR.
DISPLAY "IN ADD A YEAR AND YR2 = " YR2 " AND YR1 = " YR1.
DIVIDE YR2 BY 4
GIVING JUNK-ANS REMAINDER REM-YR.
IF REM-YR = 0
ADD 366 TO YRS-DAYS
ADD 365 TO YRS-DAYS.
ADD 1 TO YR2.
DISPLAY "YRS-DAYS " YRS-DAYS " YR2 " YR2.

6. PROCEDURE DIVISION. Using 2 dates 000102 and 981231 MAINLINE.
PERFORM B-100-DATE-DIFF
UNTIL DO-ANS = "N".
STOP RUN.
B-100-DATE-DIFF.
DISPLAY "ROUTINE TO SUBTRACT SECOND DATE FROM FIRST DATE".
DISPLAY "ENTER FIRST DATE - YYMMDD"
(YR1=00 MO1=01 DA1=02)
ACCEPT DATE1.
DISPLAY "ENTER SECOND DATE - YYMMDD"
(YR2=98 MO2=12 DA2=31)
ACCEPT DATE2.
PERFORM B-200-CONVERT-1.
PERFORM B-210-CONVERT-2.
IF YR1 = YR NOT EQUAL
SUBTRACT JDA2 FROM JDA1
GIVING DAYS-ANSWER
DISPLAY "NO YEAR TO CONVERT"
DISPLAY "DAYS BETWEEN " DAYS-ANSWER
ELSE
DISPLAY "GOING TO CONVERT YEAR" GOING TO CONVERT YEAR
PERFORM B-220-CONVERT-YEAR
DISPLAY "DAYS BETWEEN " YRS-DAYS.
DAYS BETWEEN 00367
DISPLAY "ANOTHER DATE Y OR N?".
ACCEPT DO-ANS.

7. Using 2 dates 000102 and 981231 B-200-CONVERT-1. DIVIDE YR1 BY 4
GIVING JUNK-ANS REMAINDER REM-WS1. 00/4=0 REM-WS1=0
MOVE YR1 TO JYR JYR1=00
ADD DAYS-PASSED (MO1) DA1
GIVING JDA JDA1= = 002
IF REM-WS1 = 0 AND MO1 > 2
ADD 1 TO JDA1.
DISPLAY "FIRST DATE IN JULIAN " JDA1.
FIRST DATE IN JULIAN 002
B-210-CONVERT-2.
DIVIDE YR2 BY 4
GIVING JUNK-ANS REMAINDER REM-WS2. 98/4= 24 REM-WS2=2
MOVE YR2 TO JYR JYR2=98
ADD DAYS-PASSED (MO2) DA2
GIVING JDA JDA2= = 365
IF REM-WS2 = 0 AND MO2 > 2
ADD 1 TO JDA2.
DISPLAY "SECOND DATE IN JULIAN " JDA2.
SECOND DATE IN JULIAN 365

8. B-220-CONVERT-YEAR. DISPLAY "IN CONVERT YEAR" IN CONVERT YEAR
IF REM-WS2 = 0
SUBTRACT JDA2 FROM 366
GIVING YRS-DAYS
ELSE
SUBTRACT JDA2 FROM 365
GIVING YRS-DAYS YRS-DAYS= = 00000
DISPLAY "YRS-DAYS WITH JDA2 " YRS-DAYS.
YRS-DAYS WITH JDA
ADD JDA1 TO YRS-DAYS.
YRS-DAYS = = 00002
DISPLAY "YRS-DAYS AFTER JDA1 ADDDED " YRS-DAYS.
YRS-DAYS AFTER JDA1 ADDED 00002
SUBTRACT YR2 FROM YR1
GIVING YR-DIFF YR-DIFF = = 00098
DISPLAY "YR-DIFF " YR-DIFF.
YR-DIFF 00098
IF YR-DIFF > 1
ADD 1 TO YR YR2 = = 99
(stored in 2 char field as 99)
DISPLAY "YR-DIFF > 1 YR2 IS " YR2 YRDIFF > 1 YR2 IS 99
PERFORM B-300-ADD-A-YEAR
UNTIL YR2 = YR1. Until 99 = 00 (to start)
B-300-ADD-A-YEAR.
DISPLAY "IN ADD A YEAR AND YR2 = " YR2 " AND YR1 = " YR1.
IN ADD A YEAR AND YR2 = 99 AND YR1 = 00
DIVIDE YR2 BY 4
GIVING JUNK-ANS REMAINDER REM-YR. 99/4=24 REM-YR = 3
IF REM-YR = 0
ADD 366 TO YRS-DAYS
ADD 365 TO YRS-DAYS. YRS-DAYS = = 00367
ADD 1 TO YR2. YR2 = 00 ( IN 2 CHAR FIELD = 00)
DISPLAY "YRS-DAYS " YRS-DAYS " YR2 " YR2.
YRS-DAYS YR2 00

9. PROCEDURE DIVISION. Using 2 dates 000325 and 981028 MAINLINE.
PERFORM B-100-DATE-DIFF
UNTIL DO-ANS = "N".
STOP RUN.
B-100-DATE-DIFF.
DISPLAY "ROUTINE TO SUBTRACT SECOND DATE FROM FIRST DATE".
DISPLAY "ENTER FIRST DATE - YYMMDD"
(YR1=00 MO1=03 DA1=25)
ACCEPT DATE1.
DISPLAY "ENTER SECOND DATE - YYMMDD"
(YR2=98 MO2=10 DA2=28)
ACCEPT DATE2.
PERFORM B-200-CONVERT-1.
PERFORM B-210-CONVERT-2.
IF YR1 = YR NOT EQUAL
SUBTRACT JDA2 FROM JDA1
GIVING DAYS-ANSWER
DISPLAY "NO YEAR TO CONVERT"
DISPLAY "DAYS BETWEEN " DAYS-ANSWER
ELSE
DISPLAY "GOING TO CONVERT YEAR" GOING TO CONVERT YEAR
PERFORM B-220-CONVERT-YEAR
DISPLAY "DAYS BETWEEN " YRS-DAYS.
DAYS BETWEEN 00514
DISPLAY "ANOTHER DATE Y OR N?".
ACCEPT DO-ANS.

10. B-200-CONVERT-1. Using 2 dates 000325 and 981028 DIVIDE YR1 BY 4
GIVING JUNK-ANS REMAINDER REM-WS1. 00/4=0 REM-WS1=0
MOVE YR1 TO JYR JYR1=00
ADD DAYS-PASSED (MO1) DA1
GIVING JDA JDA1= = 084
IF REM-WS1 = 0 AND MO1 > 2
ADD 1 TO JDA JDA1= = 085
DISPLAY "FIRST DATE IN JULIAN " JDA1.
FIRST DATE IN JULIAN 085
B-210-CONVERT-2.
DIVIDE YR2 BY 4
GIVING JUNK-ANS REMAINDER REM-WS2. 98/4= 24 REM-WS2=2
MOVE YR2 TO JYR JYR2=98
ADD DAYS-PASSED (MO2) DA2
GIVING JDA JDA2= = 301
IF REM-WS2 = 0 AND MO2 > 2
ADD 1 TO JDA2.
DISPLAY "SECOND DATE IN JULIAN " JDA2.
SECOND DATE IN JULIAN 301

11. B-220-CONVERT-YEAR. DISPLAY "IN CONVERT YEAR" IN CONVERT YEAR
IF REM-WS2 = 0
SUBTRACT JDA2 FROM 366
GIVING YRS-DAYS
ELSE
SUBTRACT JDA2 FROM 365
GIVING YRS-DAYS YRS-DAYS= = 00064
DISPLAY "YRS-DAYS WITH JDA2 " YRS-DAYS.
YRS-DAYS WITH JDA
ADD JDA1 TO YRS-DAYS.
YRS-DAYS = = 00149
DISPLAY "YRS-DAYS AFTER JDA1 ADDDED " YRS-DAYS.
YRS-DAYS AFTER JDA1 ADDED 00149
SUBTRACT YR2 FROM YR1
GIVING YR-DIFF YR-DIFF = = 00098
DISPLAY "YR-DIFF " YR-DIFF.
YR-DIFF 00098
IF YR-DIFF > 1
ADD 1 TO YR YR2 = = 99
(stored in 2 char field as 99)
DISPLAY "YR-DIFF > 1 YR2 IS " YR2 YRDIFF > 1 YR2 IS 99
PERFORM B-300-ADD-A-YEAR
UNTIL YR2 = YR1. Until 99 = 00 (to start)
B-300-ADD-A-YEAR.
DISPLAY "IN ADD A YEAR AND YR2 = " YR2 " AND YR1 = " YR1.
IN ADD A YEAR AND YR2 = 99 AND YR1 = 00
DIVIDE YR2 BY 4
GIVING JUNK-ANS REMAINDER REM-YR. 99/4=24 REM-YR = 3
IF REM-YR = 0
ADD 366 TO YRS-DAYS
ADD 365 TO YRS-DAYS. YRS-DAYS = = 00514
ADD 1 TO YR2. YR2 = 00 ( IN 2 CHAR FIELD = 00)
DISPLAY "YRS-DAYS " YRS-DAYS " YR2 " YR2.
YRS-DAYS YR2 00

12. Using 2 dates 050325 and 981028 PROCEDURE DIVISION. MAINLINE.
PERFORM B-100-DATE-DIFF
UNTIL DO-ANS = "N".
STOP RUN.
B-100-DATE-DIFF.
DISPLAY "ROUTINE TO SUBTRACT SECOND DATE FROM FIRST DATE".
DISPLAY "ENTER FIRST DATE - YYMMDD"
(YR1=05 MO1=03 DA1=25)
ACCEPT DATE1.
DISPLAY "ENTER SECOND DATE - YYMMDD"
(YR2=98 MO2=10 DA2=28)
ACCEPT DATE2.
PERFORM B-200-CONVERT-1.
PERFORM B-210-CONVERT-2.
IF YR1 = YR NOT EQUAL
SUBTRACT JDA2 FROM JDA1
GIVING DAYS-ANSWER
DISPLAY "NO YEAR TO CONVERT"
DISPLAY "DAYS BETWEEN " DAYS-ANSWER
ELSE
DISPLAY "GOING TO CONVERT YEAR" GOING TO CONVERT YEAR
PERFORM B-220-CONVERT-YEAR
DISPLAY "DAYS BETWEEN " YRS-DAYS.
DAYS BETWEEN 02340
DISPLAY "ANOTHER DATE Y OR N?".
ACCEPT DO-ANS.

13. Using 2 dates 050325 and 981028 B-200-CONVERT-1. DIVIDE YR1 BY 4
GIVING JUNK-ANS REMAINDER REM-WS1. 05/4=1 REM-WS1=1
MOVE YR1 TO JYR JYR1=05
ADD DAYS-PASSED (MO1) DA1
GIVING JDA JDA1= = 084
IF REM-WS1 = 0 AND MO1 > 2
ADD 1 TO JDA1.
DISPLAY "FIRST DATE IN JULIAN " JDA1.
FIRST DATE IN JULIAN 084
B-210-CONVERT-2.
DIVIDE YR2 BY 4
GIVING JUNK-ANS REMAINDER REM-WS2. 98/4= 24 REM-WS2=2
MOVE YR2 TO JYR JYR2=98
ADD DAYS-PASSED (MO2) DA2
GIVING JDA JDA2= = 301
IF REM-WS2 = 0 AND MO2 > 2
ADD 1 TO JDA2.
DISPLAY "SECOND DATE IN JULIAN " JDA2.
SECOND DATE IN JULIAN 301

14. Using 2 dates 050325 and 981028 B-220-CONVERT-YEAR.
DISPLAY "IN CONVERT YEAR" IN CONVERT YEAR
IF REM-WS2 = 0
SUBTRACT JDA2 FROM 366
GIVING YRS-DAYS
ELSE
SUBTRACT JDA2 FROM 365
GIVING YRS-DAYS YRS-DAYS= = 00064
DISPLAY "YRS-DAYS WITH JDA2 " YRS-DAYS.
YRS-DAYS WITH JDA
ADD JDA1 TO YRS-DAYS.
YRS-DAYS = = 00148
DISPLAY "YRS-DAYS AFTER JDA1 ADDDED " YRS-DAYS.
YRS-DAYS AFTER JDA1 ADDED 00148
SUBTRACT YR2 FROM YR1
GIVING YR-DIFF YR-DIFF = = 00093
DISPLAY "YR-DIFF " YR-DIFF.
YR-DIFF 00093
IF YR-DIFF > 1
ADD 1 TO YR YR2 = = 99
(stored in 2 char field as 99)
DISPLAY "YR-DIFF > 1 YR2 IS " YR2 YRDIFF > 1 YR2 IS 99
PERFORM B-300-ADD-A-YEAR
UNTIL YR2 = YR1. Until 99 = 05 (to start)
END WHEN 05 = 05

15. B-300-ADD-A-YEAR.
DISPLAY "IN ADD A YEAR AND YR2 = " YR2 " AND YR1 = " YR1.
PASS 1: IN ADD A YEAR AND YR2 = 99 AND YR1 = 05
PASS 2: IN ADD A YEAR AND YR2 = 00 AND YR1 = 05
PASS 3: IN ADD A YEAR AND YR2 = 01 AND YR1 = 05
PASS 4: IN ADD A YEAR AND YR2 = 02 AND YR1 = 05
PASS 5: IN ADD A YEAR AND YR2 = 03 AND YR1 = 05
PASS 6: IN ADD A YEAR AND YR2 = 04 AND YR1 = 05
DIVIDE YR2 BY 4
GIVING JUNK-ANS REMAINDER REM-YR.
PASS 1: 99/4=24 REM-YR = 3
PASS 2: 00/4=0 REM-YR = 0
PASS 3: 01/4=0 REM-YR = 1
PASS 4: 02/4=0 REM-YR = 2
PASS 5: 03/4=0 REM-YR = 3
PASS 6: 04/4=1 REM-YR = 0
IF REM-YR = 0
ADD 366 TO YRS-DAYS
PASS 2: YRS-DAYS = = 00879
PASS 6: YRS-DAYS = = 02340
ELSE
ADD 365 TO YRS-DAYS.
PASS 1: YRS-DAYS = = 00513
PASS 3: YRS-DAYS = = 01244
PASS 4: YRS-DAYS = = 01609
PASS 5: YRS-DAYS = = 01974
ADD 1 TO YR2.
PASS 1: YR2 = 00 ( IN 2 CHAR FIELD = 00)
PASS 2: YR2 = = 01
PASS 3: YR2 = = 02
PASS 4: YR2 = = 03
PASS 5: YR2 = = 04
PASS 6: YR2 = = 05
DISPLAY "YRS-DAYS " YRS-DAYS " YR2 " YR2.
PASS 1: YRS-DAYS YR2 00
PASS 2: YRS-DAYS YR2 01
PASS 3: YRS-DAYS YR2 02
PASS 4: YRS-DAYS YR2 03
PASS 5: YRS-DAYS YR2 04
PASS 6: YRS-DAYS YR2 05