Incorrect, that is NOT what the Bible says. It says this ...
No DAY or HOUR is known for Christ’s return.
The number 2028 is a YEAR !
The phrase "no man knows the day or hour" is a Jewish idiom referring to the Feast of Trumpets.
God's 7 yearly Holidays (Feasts) prophesied the VERY DAY the Messiah (Jesus Christ) would fulfill his biggest tasks ...
THE 7 FEASTS (LEVITICUS 23)
1 - Passover - VERY DAY Christ died
2 - Unleavened Bread - VERY DAYS Christ buried
3 - First Fruits - VERY DAY Christ resurrected
4 - Weeks - VERY DAY Christ sent Holy Ghost
5 - Trumpets - VERY DAY Christ will return
6 - Atonement - VERY DAY Christ will forgive
7 - Tabernacles - VERY DAY Christ will live with us
Number 5 - Feast of Trumpets - was known to the Jews as the feast "no man knows the day or hour" because it was the only Holiday of the 7 to occur on the first day of the month.
And since the Jew's months were lunar based, the Feast of Trumpets could not be determined until two witnesses confirmed sighting of the new moon sliver, which could happen at any hour of any day during the 3 days of darkness during the new moon.
Thus, the Feast of Trumpets became known by the Jewish idiom ... the Feast "no man knows the day or hour"
THIS is the TIME PERIOD when Jesus will return during the calendar year AD 2028 !!!