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run code in 150+ php & hhvm versions
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<?php $timeStamp = strtotime(time()); $ayer = time() - 1 * 24 * 60 * 60; echo date(DATE_ATOM, $ayer);
Output for 5.1.3 - 7.1.0
2013-07-31T16:36:31+02:00
Output for 5.1.1 - 5.1.2
2013-07-31T16:36:31+0200
Output for 4.3.0 - 5.1.0
Notice: Use of undefined constant DATE_ATOM - assumed 'DATE_ATOM' in /in/vtldc on line 7 WedPMCESTE_PMCEST+0200Jul