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<?php echo date("Y-m-d",strtotime("01 Jan 2012")); echo "\n"; echo date("Y-m-d",strtotime("last day of Sept 2012")); ?>
Output for 5.3.0 - 7.1.0
2012-01-01 2012-09-30
Output for 4.3.0 - 5.2.17
2012-01-01 1970-01-01