Again and again it is said that no one knows when Jesus will return. But the Bible says exactly when Jesus will return. The scripture says that Jesus will come at the end of the reign of the Antichrist. We know that the Antichrist will reign for 3.5 years. So, assuming the reign of the Antichrist begins today, we know that Jesus will return in exactly 3.5 years.
Furthermore, this also disproves the idea that Jesus could return at any time. First of all, the Antichrist must appear, and since he has not yet appeared, we can say with absolute certainty that Jesus will not appear in the next 3.5 years.
1 Thessalonians 5
2 For you yourselves know accurately that the day of
the Lord comes like a thief in the night.
3 For when they shall say, Peace and safety! Then sudden destruction comes on them, as travail upon a woman with child. And they shall not escape.
4
But you, brothers, are not in darkness, that the Day should overtake you like a thief.
5 You are all the sons of light and the sons of the day. We are not of the night, or of darkness.
The day or hour is not the same as the year or the month, or the century. So obviously, when we see what Paul wrote about in 2 Thessalonians 2 taking place, we will know that there are around 3.5 years left - but we still won't know the day or the hour.
I don't know if this is true, but I've read that the day or the hour was associated by 1st century Jews with the priest blowing the shofar to declare the beginning of the Day of Trumpets, which was not blown until the first slither of the new moon had been sighted.
"Therefore watch; for you do not know what hour your Lord comes." Matthew 24:42.
It also (so I've read) has to do with the groom returning for his bride in a typical 1st century Jewish wedding. The groom would leave the town of his betrothed wife and go back to his father's house, and only return on the day appointed by his father. The bride and bridesmaids would wait for the groom to come to the bride's village to fetch her, not knowing at what time he wold come.
So we still neither know the year or the month, or even the century - but once the events spoken about by Paul in 2 Thessalonians 2 begin to occur, we know that the time is short. Less than 4 years. And the day will not like a thief overtake those who are watching and waiting, who still will not know the day or the hour.