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run code in 150+ php & hhvm versions
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<?php $time = strtotime(date('Y-m').'-01'); echo date('Y-m-d',$time); echo '<br>'.$final = date("Y-m-d", strtotime("-1 month", $time)); echo date('m-01-Y 00:00:00',strtotime('this month')) . '<br/>'; echo date('m-t-Y 12:59:59',strtotime('this month')) . '<br/>';
Output for 4.3.5 - 7.1.0
2013-08-01<br>2013-07-0108-01-2013 00:00:00<br/>08-31-2013 12:59:59<br/>
Output for 4.3.0 - 4.3.4
2013-08-01<br>2013-07-0109-01-2013 00:00:00<br/>09-30-2013 12:59:59<br/>