<?php
$a = new DateTime("2017-11-17 22:05:26.000000", new DateTimeZone('UTC'));
$b = new DateTime("2017-04-03 22:29:15.079459", new DateTimeZone('UTC'));
$diff = $a->diff($b);
var_dump($diff->h);
$a = new DateTime("2017-11-17 22:05:26.000000", new DateTimeZone('Africa/Nairobi'));
$b = new DateTime("2017-04-03 22:29:15.079459", new DateTimeZone('Africa/Nairobi'));
$diff = $a->diff($b);
var_dump($diff->h);