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run code in 150+ php & hhvm versions
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<?php $a = strtotime(date('c')); $b = strtotime(date('c', time() + 60*15)); var_dump($a-$b);
Output for 5.0.0 - 7.1.0
int(-900)
Output for 4.3.0 - 4.4.9
int(0)