<?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;
PD9waHAKCiR0aW1lMSA9IG5ldyBcRGF0ZVRpbWUoJzIwMTktMTItMDJUMTU6MTUnKTsKJHRpbWUxLT5hZGQobmV3IFxEYXRlSW50ZXJ2YWwoJ1BUOTBNJykpOwplY2hvICR0aW1lMS0+Zm9ybWF0KCdZLW0tZCBIOmknKSwgUEhQX0VPTDsKCiR0aW1lMiA9IG5ldyBcRGF0ZVRpbWUoKTsKZWNobyAkdGltZTItPmZvcm1hdCgnWS1tLWQgSDppJyksIFBIUF9FT0w7Cgp2YXJfZHVtcCgkdGltZTEgPiAkdGltZTIpOw==