Description:
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See description %c parameter on strftime: http://php.net/strftime.
It says following:

%c	Preferred date and time stamp based on local	Example: Tue Feb 5 
00:45:10 2009 for February 4, 2009 at 12:45:10 AM

Result, obviously, should be Tue Feb 4 00:45:10 2009 because of the input date 
February 4, 2009 at 12:45:10 AM.

Expected result:
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Example: Tue Feb 5 00:45:10 2009 for February 5, 2009 at 12:45:10 AM
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Actual result:
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Example: Tue Feb 5 00:45:10 2009 for February 4, 2009 at 12:45:10 AM
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