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@ 2015-04-07T07:42:53Z

<?php

$date = new DateTime('2015-01-01 18:00:00.123456');

echo $date->format('u'), PHP_EOL;

var_dump(json_encode($date));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
json_encode: documentation ( source)

preferences:dark modelive preview

46.05 ms | 402 KiB | 5 Q