Hi,
Go to SE37 --> give this ALINK_CALL_TRANSACTION function module and exicute.
then you will get another screen, there you can give SU01 and exicute ...
then you will get access to SU01 Tcode......
in the SU01 you can give your UserName and click on dispaly.... there you can check Defalut Date Format..
Hope this will be useful...
Please find below screen shots for your reference:
Regards,
Nagaraju K