There are at least three verses in the Quran that suggest that time is relative:

The angels and the Spirit ascend to Him in a day the measure of which is fifty thousand years. (Al Quran 70:4)

He will plan the Divine Ordinance from the heaven unto the earth, then shall it go up to Him in a day the duration of which is a thousand years according to what you reckon. (Al Quran 32:5)

And they ask you to hasten on punishment, but Allah will never break His promise. And verily, a day with thy Lord is as a thousand years of your reckoning. (Al Quran 22:47)