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@ 2015-09-30T08:16:18Z

<?php
$date = array('2013' => 0);
end($date);
echo key($date).'<br/>';
$newDate = new DateTime(key($date));
echo $newDate->format('Y');

Output
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end: documentation ( source)
key: documentation ( source)

preferences:dark modelive preview

52.51 ms | 402 KiB | 5 Q