Albert Barnes Commentary Matthew 24:36

"But of that day and hour knoweth no one, not even the angels of heaven, neither the Son, but the Father only." — Matthew 24:36 (ASV)

But of that day and hour. This refers to the precise time of the fulfillment. The general signs of its coming have been given; as the budding of the fig tree is a certain indication that summer is near. But the precise time is not indicated by these things. One part of their inquiry was (Matthew 24:3) when those things should be. He now replies to them by saying that the precise time would not be foretold.

No man knows, no, not the angels. See Barnes on Mark 13:32.