If u want to go the next record when the last field is enterde the set script trigger in that field (on object save)
go to record next
set field ()
if u want to keep the date field same(means previous value) until u changed the value just do it..
go to that date field in the corresponding table
then field then its option
go to auto enter tab
check the checkbox (value from last visited record).
then see what happens...........