And this is something new??
I think Jesus's point, as opposed to Hagee's speculation, is that no one will be able to discern the approach of His coming based on "signs".
"But He answered and said to them, 'An evil and adulterous generation seeks after a sign, and no sign will be given to it except the sign of the prophet Jonah. For as Jonah was three days and three nights in the belly of the great fish, so will the Son of Man be three days and three nights in the heart of the earth. '" (Matt. 12:39,40)
Modern sign seekers and followers of folks like word-faith guru Hagee ought to be wary.
I think you missed Christ's points at least by half.
He made it clear that the unGodly unbelievers wouldn't have a clue.
He did also chide Believers who could tell the weather but not read the signs accurately--encouraging them to read the signs better and be alert for the end times and His return.
We cannot know the day or hour but we can tell we are in the last days (2Tim.3) and latter times (1Tim.4)