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run code in 150+ php & hhvm versions
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<?php $x = (string) intval(date('Y'))-1; $x .= '-1-1'; echo $x; echo '\n'; echo date('Y-m-d',strtotime($x));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
2012-1-1\n2012-01-01