Overall meaning : Those who deny the resurrection scornfully ask you, Muhammad, about the time fixed for it, ‘When will it take place?’
You should not be concerned about its time, nor is it for you to know it. The ultimate knowledge of it rests solely with your Lord. Your duty is only to warn those who fear its coming. The day they will be raise up from their graves, it will seem to them as though they had not stayed in the worldly life except for a very short time—nor more than one evening or one morning!