<?php

final class MutableClock implements Clock
{
    /**
     * @var string
     */
     private $time;

    public function __construct()
    {
        $this->time = 'now';
    }

    public function setTime($time)
    {
        $this->time = $time;
    }

    /**
     * {@inheritdoc}
     */
    public function now()
    {
	return new \DateTimeImmutable($this->time);
    }
}