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run code in 150+ php & hhvm versions
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<?php $da='2014-04-26'; $date = strtotime($da .' -8 days'); $final=date('Y-m-d', $date); echo $final; ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
2014-04-18