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run code in 200+ php & hhvm versions
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<?php echo DateTime::createFromFormat('m-Y', '01-2017')->format('t-m-Y');
based on oNhcU
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
31-01-2017