<?php

$time1 = new \DateTime('2019-12-02T15:15');
$time1->add(new \DateInterval('PT90M'));
echo $time1->format('Y-m-d H:i'), PHP_EOL;

$time2 = new \DateTime();
echo $time2->format('Y-m-d H:i'), PHP_EOL;

var_dump($time1 > $time2);