Variable Exit - Last Three months date range based on Sy-datum

Question

Hi
I have a requirement to filter last 3months data based on sy-datum. I have a variable filter on Posting Date.
For e.g. Today is 20110622
I have to determine below range: When users run the report prompt should be auto filled with below date range.
From Value: 20110301
To Value     : 20110531
From sy-datum I can find the first day of the current month - In this scenario 20110601 (I'll replace last 2 characters with "01").
If I subtract "-1" I'll get the To Value: 20110531
Question is to get the "From Value". If I subtract 90days from To value, it will work for few months.
For e.g. If my To value is Feb 28th and if I subtract 90days, I may get a different answer.
Is there any better approach to determine this date range?
Thanks for your help.
Best Regards,
Sree

Answer 1

Hi Sree,
  Pleae find this approach and compare
data : l_date type sy-datum,
l_startdate type sy-datum,
l_endate type sy-datum,
l_startmonth(6) type c,
l_endmonth(6) type c,
l_date = sy-datum.   say "20110622
l_endmonth = sydatum(6)   "201106
Pass year month and get previous month using this standard .
          CALL METHOD cl_rs_time_service=>shift_year_month
            EXPORTING
              i_year_month = l_endmonth
              i_shift      =  -1
            RECEIVING
              r_year_month = l_endmonth
            EXCEPTIONS
              failed       = 1
              OTHERS       = 2.
"l_endmonth = 201105.
          CALL METHOD cl_rs_time_service=>shift_year_month
            EXPORTING
              i_year_month = l_endmonth
              i_shift      =  -2
            RECEIVING
              r_year_month = l_startmonth
            EXCEPTIONS
              failed       = 1
              OTHERS       = 2.
"l_startmonth = 201103
l_startdate(6) = l_startmonth.
l_startdate+6(2) = '01'.
"l_startdate = 20110301
We got startdate in and we want to get enddate , but we got endmonth ...
now we need to get last date of the endmonth.
Use this function module SLS_MISC_GET_LAST_DAY_OF_MONTH  and u can get it. Input should be date.
so put l_enddate+6(2) = '01'.
l_enddate(6) = l_endmonth.
now pass end date to the  Function module and this will return the end date of the month.
So you get l_startdate and l_enddate as you require. This will work for leap years or feb 28 days what ever...
Regards
vamsi
Edited by: vamsi talluri on Jun 22, 2011 10:06 PM