1. Since Christians are not subject to the Tribulation
Christians are subject to the Trib. Rev 12:17
Rev 12:17 And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
, they need not worry about which day it will begin.
2. Christs does NOT return on the first day of the Tribulation. So that is a non-issue.
He returns when the trib is over, which is where the bible places the rapture.
1Th 4:13 But I would not have you to be ignorant, brethren, concerning them which are asleep, that ye sorrow not, even as others which have no hope.
1Th 4:14 For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God
bring with him.
(second coming reference)
1Th 4:15 For this we say unto you by the word of the Lord, that we which are alive and remain unto
the coming of the Lord (second coming reference) shall not prevent them which are asleep.
1Th 4:16 For
the Lord himself shall descend from heaven (second coming reference) with a shout, with the voice of the archangel, and with the trump of God: and
the dead in Christ shall rise first:
(the resurrection of the dead in Christ)
1Th 4:17 Then
we which are alive and remain shall be caught up (harpazo) together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
(the rapture)[/QUOTE]