Getting 'top of the day' epoch in Python

Python's time, date and datetime modules are powerful, but I find I nearly always have to go to the docs to do even basic tasks.

I needed to get the epoch time for Midnight of a day. It took me way too long to figure how to do this, so I'm stowing this away here for next time.

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import calendar
import datetime
calendar.timegm(datetime.date(2012,9,1).timetuple())

2012-09-01