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run code in 200+ php & hhvm versions
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<?php $start = '2017-06-19'; $end = date ('Y-m-d', strtotime ($start . ' + 1 weeks - 1 day')); echo $start . "\n" . $end;
based on h0NLu
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0beta1
2017-06-19 2017-06-25