sap 中时间的问题，比如我取到系统时间后，然后要根据该系统时间推算出前三个月的年份和月份，要怎么取？
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DATA: BEGIN OF l_date,
year(4) TYPE n,
month(2) TYPE n,
day(2) TYPE n,
END OF l_date.
l_date = SY-DATUM.
DO 3 TIMES.
IF l_date-month = 1.
l_date-year = l_date-year - 1.
l_date-month = 12.
ELSE.
l_date-month = l_date-month - 1.
ENDIF.
WRITE:/ l_date-year, l_date-month.
ENDDO.
year(4) TYPE n,
month(2) TYPE n,
day(2) TYPE n,
END OF l_date.
l_date = SY-DATUM.
DO 3 TIMES.
IF l_date-month = 1.
l_date-year = l_date-year - 1.
l_date-month = 12.
ELSE.
l_date-month = l_date-month - 1.
ENDIF.
WRITE:/ l_date-year, l_date-month.
ENDDO.
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