Please note that 1 Thess 4:16 says the rapture is at  the last trump of God blown by an Angel, not the last trump blown by a priest at a feast!
While the other verse in Rev does say that the world wont tnow the  time of the Rapture, we will not be surprised by the rapture, as we are watching!  My opinion is we still cant know exactly when Jesus is coming, but today we can see that His coming is very soon!!!!
Thankyou Jesus for your Blessed Hope!!!

Lewis B