Hi Ramanjaneyulu,
Please check the import and export parameters of that fm.
You have to pass your system date (sy-datum), so the data time what you declared is correct.
But the output of the fm is week. (YYYYWW). (SCAL-WEEK).
so change the ranges key word type with week. It is not a date format.
I think you understood.
Regards,
Krishna Chaitanya.