Hi Rakesh,
As sekhar explained, select options using F4 on date selection.
There will be options like current date - days , current days + days , first day of current month, last date of current month like vise.
Eg. Time evaluation should be run for 3 month back with ref to current date.
Hence, select current date - days option using F4. Then system will ask for days. There we provided 90 days (3 Months).
So if current date is 07/09/2014 then system will run from 7/6/2014 ( 90 Days ).
Hope this will clear.
Please let me know if further details required.
Best Regards,
Ketul