How to auto save time value?

Hi all,

I would like to keep track the time when the user add a new record in
receipt entry.

Is there anyone know how to use BPM to set the time value?

Which field to save? Character/Number/Date?

Beside use BPM, is there any other way to auto save the time value?

Hope to receive all your reply. Thanks.

Best Regards,
Admund Ng