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run code in 150+ php & hhvm versions
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<?php $billDateStr = strtotime('2014-06-06 + 1 months'); echo date('Y-m-d',$billDateStr);
Output for 4.3.0 - 5.0.5, 5.1.2 - 7.1.0
2014-07-06
Output for 5.1.0 - 5.1.1
1970-01-01