I was gonna say, it's funny you ask because I just found out today about the Kanye thing that Sean mentioned. Anyway I think .. it depends on which one the deadline-maker means, so you should find out if you plan to wait 'til the last minute. I don't know which way is more usual or conventional.
The Kanye thing, though, I think is kinda silly since 5:00:59 is such an arbitrary number, what about 5:00:01?
I'd say the latter.
... anything before the 13th is ok, which starts at 00:00 h.
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