[otrs] Ticket Creation Time Stamp Edit

I want to be able to change the timestamp that a ticket is created with. Certain times I am working away from the computer and can't immediately put new tickets into the system. I end up going back a while later and entering all my tickets in however, the timestamp shows the time that I entered the tickets, not the time I actually started working on the ticket. Is there a way to change the ticket creation time stamp so my times are correctly corresponding to my work? -Bryan