Daniel 9 gives the time line of the last 7 years of the Jewish Dispensation. The covenant signed is for a 7 year period.
I disagree, but nevermind that for now. Where does Daniel 9 say anything about the day of the Lord?
Your other verses say that the DOTL comes as a thief in the night. This is a reference to the Rapture.
Yes, the rapture occurs on the day of the Lord, but so does Christ's wrath against His enemies which Paul described.
1 Thessalonians 5:2 For yourselves know perfectly that the day of the Lord so cometh as a thief in the night. 3 For when they shall say, Peace and safety; then sudden destruction cometh upon them, as travail upon a woman with child; and they shall not escape.
Can you see here that on the same day the rapture occurs "sudden destruction cometh upon" Christ's enemies from which "they shall not escape"?
Anyone in the Tribulation can calculate the day of Christ's second coming.
No, they can't. How are you coming up with that?
In other words, the second coming of Christ will not come as a thief in the night, but will come on the specified day.
Wrong. Scripture never teaches this. Have you never read these verses:
Revelation 16:15
Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame.
Matthew 24:42
Watch therefore: for ye know not what hour your Lord doth come. 43 But know this, that if the goodman of the house had known in what watch the thief would come, he would have watched, and would not have suffered his house to be broken up. 44
Therefore be ye also ready: for in such an hour as ye think not the Son of man cometh.
Revelation 16:15 is contained within a description of the sixth vial, so the tribulation obviously has already started before that and He still hasn't come as a thief in the night yet at that point.
The Matthew 24:42-44 passage makes it clear that no one will know the day or hour when Jesus will come as a thief in the night.
Note also in 1 Thes 5.2,. people will being saying "Peace and safety." This saying is the exact opposite of what people in the Tribulation will say. More than half the people on earth will be killed, complements of the Antichrist and his armies.
You are reading the book of Revelation too literally. It's a highly symbolic book. It has descriptions of blood coming down to the earth and Christ's enemies being given blood to drink and so on. You can't take all of that literally. The tribulation isn't about physical destruction, it's about an increase in deception, wickedness and apostasy as passages like Matthew 24:9-13 and 2 Thessalonians 2:1-12 indicate.
If you read the Olivet Discourse you should see that wars, earthquakes, famines and such are not signs of the nearness of Christ's return but are only "the beginning of sorrows", so you need to take that into account when reading the book of Revelation.
Matthew 24:6 And ye shall hear of wars and rumours of wars: see that ye be not troubled: for all these things must come to pass, but the end is not yet. 7 For nation shall rise against nation, and kingdom against kingdom: and there shall be famines, and pestilences, and earthquakes, in divers places. 8 All these are the beginning of sorrows.
What Jesus said right after that are the signs that His coming is near rather than physical destruction.
Matthew 24:9 Then shall they deliver you up to be afflicted, and shall kill you: and ye shall be hated of all nations for my name's sake. 10 And then shall many be offended, and shall betray one another, and shall hate one another. 11 And many false prophets shall rise, and shall deceive many. 12 And because iniquity shall abound, the love of many shall wax cold. 13 But he that shall endure unto the end, the same shall be saved.
As for 1 Thess 5:2-3, that is talking about the day Jesus returns which Matthew 24:29-31 says will be "after the tribulation of those days", so please tell me how you interpret that passage.
