<?php

require 'vendor/autoload.php';

use Kreait\Clock\FrozenClock;
use Kreait\Clock\SystemClock;

$systemClock = new SystemClock(new DateTimeZone('UTC'));
var_dump($systemClock->now());

$frozenClock = new FrozenClock(new DateTimeImmutable('2019-08-20 10:41:53'));
var_dump($systemClock->now());

$frozenClock->setTo(new DateTimeImmutable('2019-08-19 19:19:19'));
var_dump($systemClock->now());