The day of the Lord, the day of judgment, the wrath of God that’s going to hit primarily the Nation of Israel,but will spill over and effect the whole human race those 7 dreadful years that are yet to come. The day of the Lord starts way back at Isaiah chapter 2 and come up through the old Testament…and through the four gospel to a certain extend.
The Day of Christ will come only from the apostle Paul you can find no reference to the day of Christ any where else in the scripture,
The Day of the Lord for Judgment the tribulation,For the unbelievers.
The day of Jesus Christ or the day of God …calling out the believers.The rapture. The departure ( carried away) the Rapture only happens once. The tribulation only happens once. The bible said blessed are those who are in the first Resurrection.
Looking for that blessed hope, and the glorious appearing of the great God and our Saviour Jesus Christ Titus 2:13