The below code snippet can subtract any given number of months from a date.
01 MONTH-END-DD PIC X(24) VALUE '312831303130313130313031'.
01 TBL-MONTH-END REDEFINES MONTH-END-DD.
03 TBL-MONTH-END-DAY OCCURS 12 TIMES.
05 TBL-MONTH-END-DD PIC 9(02).
01 WS-DATE.
02 YYYY PIC 9(4).
02 MM PIC 99.
02 DD PIC 99.
MOVE INPUT-DATE TO WS-DATE
DIVIDE WS-NO-OF-MONTHS BY 12 GIVING WS-NO-OF-YEARS
REMAINDER WS-REMAINING-MONTHS
SUBTRACT WS-NO-OF-YEARS FROM YYYY
IF MM > WS-REMAINING-MONTHS
COMPUTE MM = MM - WS-REMAINING-MONTHS
ELSE
SUBTRACT 1 FROM YYYY
COMPUTE MM = 12 - WS-REMAINING-MONTHS
END-IF
IF ( FUNCTION MOD (YYYY, 400) = 0) OR
( FUNCTION MOD (YYYY, 4) = 0 AND
FUNCTION MOD (YYYY, 100) NOT = 0 )
MOVE '29' TO TBL-MONTH-END-DD (3:2)
ELSE
MOVE '28' TO TBL-MONTH-END-DD (3:2)
END-IF
IF DD > TBL-MONTH-END-DAY (MM)
MOVE TBL-MONTH-END-DAY (MM) TO DD
END-IF
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