Today, the relativity of time is a proven scientific fact. This was revealed by Einstein's theory of relativity during the early part of the 20th century. Until then, it was not known that time was relative, nor that it could change according to the circumstances. Yet, the renowned scientist Albert Einstein proved this fact by discovering the theory of relativity. He showed that time is dependent on mass and velocity.
However, the Qur'an had already included information about time's being relative! Some verses about the subject read:
… A day with your Lord is equivalent to a thousand years in the way you count. (Qur'an, 22:47)
He directs the whole affair from heaven to earth. Then it will again ascend to Him on a Day whose length is a thousand years by the way you measure. (Qur'an, 32:5)
The angels and the Spirit ascend to Him in a day whose length is fifty thousand years. (Qur'an, 70:4)
The fact that the relativity of time is so definitely mentioned in the Qur'an, which began to be revealed in 610, is more evidence that it is a divine book.