The Son of Man ... will reign till he descends on the earth to put all enemies under his feet, which time is nigh at hand. but the hour and the day no man knoweth, neither the angels in heaven, nor shall they know until he comes. 49:6

Trivia: What man in the Doctrine and Covenants is said to be a perfect man who looked just like his father - so much so, in fact, that they could only be distinguished by their age?