I'd asked before how to convert a unix timestamp to the hour that it is
in (and got the perfect answer) :
1298999201 = 3/1/2011 11:06:41 AM
(1298999201 - (1298999201 % 3600)) = 3/1/2011 11:00:00 AM

Now getting the timestamp converted to midnight of that same day isn't
as simple as:
1298999201 - (1298999201 % 85400)
That just gives me a unix time from yesterday...

How can I convert 1298999201 (3/1/2011 11:06:41 AM) to 1298959200
(3/1/2011 12:00:00 AM)?


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