The question comes up occasionally, perhaps because of what is stated in the gospel of Mark: “Heaven and earth shall pass away; but my words shall not pass away. But of that day and that hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father” (Mark 13:31-32; emphasis added). the phrase “neither the Son” is not found in Matthew or Luke. Jesus Christ knows all things; He possesses the fulness of the glory and power of the Father (see Doctrine & Covenants 93:16-17). Surely He knows when He will return. if He did not know the exact day or time of His return in glory when the Olivet prophecy was uttered, then certainly after His Resurrection and glorification He came to know. It is worth noting that the Joseph Smith Translation of this verse omits the disputed phrase.

Sperry Symposium Classics, Brigham Young University, Religious Studies Center, 2004, p. 201.