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<?php print strtotime( "2013/12/10 13:03")-strtotime(""); ?>
based on 05hNj
Output for 5.1.2 - 7.3.0rc4
1386676980
Output for 5.1.0 - 5.1.1
-49124053
Output for 5.0.1 - 5.0.5
Warning: strtotime(): Called with an empty time parameter. in /in/GLSuW on line 2 1386676981
Output for 4.3.2 - 5.0.0
Notice: strtotime(): Called with empty time parameter in /in/GLSuW on line 2 -49111020
Output for 4.3.1
Notice: strtotime() [http://www.php.net/function.strtotime]: Called with empty time parameter in /in/GLSuW on line 2 -49111020
Output for 4.3.0
Notice: strtotime() [http://www.php.net/function.strtotime]: Called with empty time parameter in /in/GLSuW on line 2 -56195820