Mar 13:23 "But take ye heed: behold, I have foretold you all things." is a verse from one of the text you used, "Mar 13:32 But of that day and that hour knoweth no man, no, not the angels which are in heaven, neither the son, but the Father. both verses are spoken by Christ, which one then is untrue?
Both are true. Mark 13:23 is one of all the things Jesus tells us.
God Bless you. Charlie