Hi,
if you are using the BW 7.x
map the created on date/change date/ modified date to 0CALDAY form source to target.
if don't idea which date you can use check with the client for 0CALDAY.
if you are using the BW 3.x check the below scrren shot for reference at update rules level.
please let me know have any queries.
Thanks,
Phani.