- var_dump: documentation ( source)
- date_create_from_format: documentation ( source)
<?php
$format = 'Y-m-d\TH:i:s.u\Z';
$stringDateTime = (new \DateTime())->format($format);
var_dump(date_create_from_format($format, $stringDateTime));
$format = \DateTime::ISO8601;
$stringDateTime = (new \DateTime())->format($format);
var_dump(date_create_from_format($format, $stringDateTime));