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run code in 200+ php & hhvm versions
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<?php var_dump(date("Y-m-d", strtotime("2013-01"))); ?>
Output for 5.0.0 - 5.0.5, 5.2.7 - 7.2.0
string(10) "2013-01-01"
Output for 5.1.0 - 5.2.6
string(10) "2013-01-10"
Output for 4.3.0 - 4.4.9
string(10) "1970-01-01"