Calendar week: how to substract a number of calendar weeks from a given one

Hi Experts,
Is there a way to calculate this:
If my calendar week is 01.2009 and I want to calculate the corresponding week 18 weeks ago, is there a FM that calculates this?
I tried 01.2009 - 18 but is giving me the wrong week.
Thanks in advance.
Inma

DATA : GV_MONDAY TYPE D,
       GV_DATES TYPE I,
       GV_WEEK   TYPE KWEEK.
PARAMETERS: P_WEEK TYPE KWEEK DEFAULT '200901',
            P_WEEKS TYPE I.
START-OF-SELECTION.
CALL FUNCTION 'WEEK_GET_FIRST_DAY'
    EXPORTING
      WEEK         = P_WEEK
    IMPORTING
      DATE         = GV_MONDAY
    EXCEPTIONS
      WEEK_INVALID = 1
      OTHERS       = 2.
IF SY-SUBRC 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
GV_DATES = P_WEEKS * 7.
GV_MONDAY = GV_MONDAY - GV_DATES.
CALL FUNCTION 'DATE_GET_WEEK'
    EXPORTING
      DATE              = GV_MONDAY
   IMPORTING
     WEEK               = GV_WEEK
   EXCEPTIONS
     DATE_INVALID       = 1
     OTHERS             = 2
IF SY-SUBRC 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
WRITE :/ P_WEEK, '-', P_WEEKS , ': =', GV_WEEK.
Regards,
Shafivullah Mohammad
Edited by: shafivullah mohammad on Jul 9, 2009 12:44 PM

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