Jesus said no one knows the day or the hour, however He didn’t say you couldn’t figure out the year or season. In fact He specifically instructed us to watch for the signs.
And God also told Daniel that certain things wouldn’t be able to be understood until the very end:
But thou, O Daniel, shut up the words, and seal the book, even to the time of the end…
Daniel 12:4
We can’t be 100% certain of the exact dates of past events in history that long ago, however we have a general idea from historians.
Luke in the Bible records the government officials and high priests in place when John the Baptist began his ministry:
Now in the fifteenth year of the reign of Tiberius Caesar, Pontius Pilate being governor of Judaea, and Herod being tetrarch of Galilee, and his brother Philip tetrarch of Ituraea and of the region of Trachonitis, and Lysanias the tetrarch of Abilene,
Luke 3:1-3
Annas and Caiaphas being the high priests, the word of God came unto John the son of Zacharias in the wilderness.
And he came into all the country about Jordan, preaching the baptism of repentance for the remission of sins;
Therefore we can go back in history and get the approximate dates.
John began baptizing in the 15th year of Tiberius Caesar. According to historians, Tiberius reigned from ~14-37 AD.
We also know from our history books that Pontius Pilate ruled Judea from around ~26-36 AD. Pontius Pilate was the prefect of the Roman province of Judaea. So that narrows it down even further.
Now again the exact dates we can’t be certain of, however that’s the general consensus.
That means John started his ministry sometime in the mid-to-late 20’s AD, give or take, assuming historians are correct or mostly correct on the dates (they may be off by a year or so).
Knowing that there’s only 2 prophetic 1000-year days left after Jesus, you simply add 2000 to 26-36 A.D.
This means Jesus will most likely return sometime in the mid 2020’s to mid 2030’s.