Can I change the date of bit sat exam
No, you can't change the date slot once it is confirmed you may contact to BITS pilani is you want and if you have a geniune reason they may help you but the chances are low as the slot booking will be close on 10 April almost all the slots must be booked by now but you can give it a try, though the chances are rough.
You can get their contact details by going through their website.
Hope It Helps.