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run code in 200+ php & hhvm versions
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<?php var_dump(date('UTC',strtotime('last hour')));
based on kT3Bj
Output for 5.4.0 - 7.1.0, 7.1.6 - 7.2.0
string(15) "1445013233CESTC"
Output for 7.1.5
string(15) "1445013234CESTC"