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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(DateTime::ISO8601);
Output for 5.5.0 - 5.6.30, hhvm-3.12.14 - 3.22.0, 7.0.0 - 7.3.0beta1
string(13) "Y-m-d\TH:i:sO"