<?php
$format = "Y-m-dTH:i:sZ";
$timestamp = strtotime("2017-08-18T16:51:37.5Z"); $local_datetime = date($format, $timestamp); // your code goes here
PD9waHAKJGZvcm1hdCA9ICJZLW0tZFRIOmk6c1oiOwokdGltZXN0YW1wID0gc3RydG90aW1lKCIyMDE3LTA4LTE4VDE2OjUxOjM3LjVaIik7CmRhdGVfZGVmYXVsdF90aW1lem9uZV9zZXQoIkV1cm9wZS9Mb25kb24iKTsKJGxvY2FsX2RhdGV0aW1lID0gZGF0ZSgkZm9ybWF0LCAkdGltZXN0YW1wKTsKJHdoZW4gPSBkYXRlX3BhcnNlKCRsb2NhbF9kYXRldGltZSk7CnByaW50X3IoJGxvY2FsX2RhdGV0aW1lKTsKLy8geW91ciBjb2RlIGdvZXMgaGVyZQ==