Some people believe that the Lord Jesus Christ's 2nd coming to Earth will take place on the Day of Atonement.  If the Rapture-Resurrection of the Bride of Christ takes place on the Eve of Rosh Hashanah, 9/18/2020, the 2nd coming of Christ to Earth will not take place on the Day of Atonement. 

If you believe in 1,260 days of Great Tribulation, then from the Eve of Rosh Hoshanah, 9/18/2020 through Feb. 29, 2024 is 1,260 days which means the Lord Jesus would return on 2/29/2024.  (The Eve of the Day of Atonement, Yom Kippur is 10/11/2024 and Yom Kippur itself is 10/12/2024.)  However, if you believe in 1,260 days of tribulation with 1,260 days of Great Tribulation, then 2,520 days from the Eve of Rosh Hoshanah, 9/18/2020 through August 12, 2027 on Av 9 would be 2,520 days.  The 2,520th day would be the 2nd coming of the Lord Jesus on 8/12/2027 on Av 9, the day the 1st & 2nd temple were destroyed. (The Eve of the Day of Atonement, Yom Kippur is 9/10/27 with Yom Kippur itself on 9/11/2027 which means His 2nd coming does not take place on the Day of Atonement.)