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run code in 150+ php & hhvm versions
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<?php var_dump(strtotime('20:12:59 Jan 13, 2009 PST'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
int(1231906379)