Okay, Custom Time is a new feature to Gmail. 10 times a year you can make it look like you sent an Email sooner than you really did! One person Even got RadioHead tickets for FREE by using the "first come first serve" scenario! You can make it look like Now, 1 Hour Ago, 6 Hours Ago or Custom. You can make it go back to April 1 2004, the first launch of Gmail. This is true. No lie. Look it up!!!!
~also works for overdue homework assignments