<?php

$str = "2019-05-13T10:00:00.000Z";
var_dump(DateTime::createFromFormat(DateTime::RFC3339_EXTENDED, $str));
var_dump(DateTime::createFromFormat(DateTime::ISO8601, $str));
var_dump(DateTime::createFromFormat(DateTime::ATOM, $str));
var_dump(DateTime::createFromFormat('Y-m-d\TH:i:s.uO', $str));