The Bible says there are signs of when the second coming will be but it also says that no person knows when. It is completely non Biblical to say you know.
We’ll know the season but no man knows the day, is what scripture tells us.
Basically it says you’ll know the general time of Jesus coming in the clouds to take the saved ones away (the Rapture) but not the exact time. It’s sometimes worded that you’ll know the season, but not the day or hour.
Now, that’s the Rapture — BUT — those who are in the Tribulation time will know the exact day when Jesus returns to set up his Kingdom on earth. At the time that the Tribulation starts - it goes like clockwork, down to the day.
So before the Rapture, you don’t know the exact time. At the time of the 7-year Tribulation, the timing is outlined down to the day.