What is your textual proof that the confirming of the covenant for 7 years is the beginning of the Day of the Lord ?
Daniel 9:24-27 King James Version (KJV)
24 Seventy weeks are determined upon thy people and upon thy holy city, to finish the transgression, and to make an end of sins, and to make reconciliation for iniquity, and to bring in everlasting righteousness, and to seal up the vision and prophecy, and to anoint the most Holy.
25 Know therefore and understand, that from the going forth of the commandment to restore and to build Jerusalem unto the Messiah the Prince shall be seven weeks, and threescore and two weeks: the street shall be built again, and the wall, even in troublous times.
26 And after threescore and two weeks shall Messiah be cut off, but not for himself: and the people of the prince that shall come shall destroy the city and the sanctuary; and the end thereof shall be with a flood, and unto the end of the war desolations are determined.
27 And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and that determined shall be poured upon the desolate.
After the 70th week is completed- Israel anoints Jesus as king! Then when you look at REvelation and see the 1260 days (3 1/2 years) it doesn't take rocket science to do the simple math!
Actually not. What takes place before the 2Thessalonians2:4 act, that makes the time of the 7 years up to that point - tribulation?
What happens prior? The opening of the 6th seal which starts the 70th week.
Rev. 6:
12 And I beheld when he had opened the sixth seal, and, lo, there was a great earthquake; and the sun became black as sackcloth of hair, and the moon became as blood;
13 And the stars of heaven fell unto the earth, even as a fig tree casteth her untimely figs, when she is shaken of a mighty wind.
14 And the heaven departed as a scroll when it is rolled together; and every mountain and island were moved out of their places.
15 And the kings of the earth, and the great men, and the rich men, and the chief captains, and the mighty men, and every bondman, and every free man, hid themselves in the dens and in the rocks of the mountains;
16 And said to the mountains and rocks, Fall on us, and hide us from the face of him that sitteth on the throne, and from the wrath of the Lamb:
17 For the great day of his wrath is come; and who shall be able to stand?
One of the common terms in the minor prophets for the 70th week of Daniel oir the tribulation period is the time of the Lords trouble /wrath!
When the antichrist enters the temple and sits in the holy place (between the angels on the ark of the covenant) we know this is the Aof D and that happens at teh mid point of the tribulation and begins what Jesus called the time of great tribulation- which will be the seven vial judgments.