Description:
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Strtotime() is producing unusual numbering whether running on a server or a fresh install on localhost without modifying php.ini. 

Example given in the docs is "10 September 2000". 
strtotime("10 September 2000") works; however, it is a day off. I thought this is due to time zone issues, but when trying the below script it produces a result of December 12, 2000. More than 24 hours off--doesn't seem possible just because of time zones. The higher you go up, the further off it gets--but some work okay. I can't explain it, but I've listed a few samples below.

Test script:
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<?php
echo date( "F n, Y", strtotime( "10 September 2000") ); //prints September 9, 2000
echo date( "F n, Y", strtotime( "10 December 2000") ); //prints December 12, 2000
echo date( "F n, Y", strtotime( "25 December 2013") ); //prints December 12, 2013
echo date( "F n, Y", strtotime( "2014-12-25") ); //prints December 12, 2013
echo date( "F n, Y", strtotime( "2014-05-05") ); //prints May 5, 2014
?>

Expected result:
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I expected the time to be formatted correctly.

Actual result:
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Please see the test-script...I've added comments by each echo statement.