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Bugs & Features
<?php var_dump((new \DateTime('+600s'))->format(DateTime::ATOM));
based on NlHgo

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for Typed properties v2
string(25) "2017-07-05T16:11:42+06:00"
Output for Arrow functions
string(25) "2017-07-05T16:11:42+06:00"

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page