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run code in 200+ php & hhvm versions
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<?php var_dump(date('Y-m-d', strtotime('-20 days'))); var_dump(date('Y-m-d', time() - 60 * 60 * 24 * 20));
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.1.0 - 7.3.0rc3
string(10) "2018-04-26" string(10) "2018-04-26"