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run code in 200+ php & hhvm versions
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<?php $sinceDate = '30/12/1988'; var_dump(date('Y-m-d', strtotime($sinceDate)));
based on qd7kg
Output for 5.6.0 - 5.6.30, hhvm-3.12.14 - 3.17.3, 7.0.0 - 7.3.0alpha1
string(10) "1970-01-01"