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run code in 150+ php & hhvm versions
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<?php echo strtotime('19001211'); echo date('Ymd', strtotime('19001211'));
based on Fol98
Output for 4.3.0 - 5.0.5, 5.2.6 - 7.1.0
-217926837219001211
Output for 5.1.0 - 5.2.5
19700101