The following examples show how the ADD-DURATION intrinsic function can be used:
MOVE FUNCTION ADD-DURATION (date-3 MONTHS 1)
TO date-2.
MOVE FUNCTION ADD-DURATION (date-3 MONTHS int-1 * 2)
TO date-1.
MOVE FUNCTION ADD-DURATION (date-1 YEARS 1 MONTHS 5 DAYS 23)
TO date-2.