Congratulations.... you now know more than Jesus.
I’m sure glad He has a sense of humor.
That is a bit unfair, after all the Bible teaches that we have free will and in his incarnate form at the time Jesus said that to His audience, he had made Himself a little lower than the Angels and did not have ‘all of time’ vision to call upon, so He was being honest in that state of His being. The fixed endtime dates became fixed only after the free will of men had been allowed thus the endtime dates may have been possible at many junctures of History but avcoided by the free choices made by men. BUT we may have seen the negative choices and the added identity of Israel restored thus these may in fact be the set dates now that Jesus then could not see.