“1,290 days.” This is 30 days longer than the 1,260 days that are the last half of the Tribulation. This 30 days is the period of time it will take to prepare the nations for Judgment after the Tribulation and the Battle of Armageddon.
The period of tribulation spoken of in Daniel 12:1 and Matthew 24:21 will be seven years, starting with the covenant made between the Antichrist and Israel, and ending with the Battle of Armageddon, when Jesus defeats the Antichrist (called “the beast” in Rev. 19:19-20). We learn about the seven years from Daniel 9:25-27, which speaks of a “week,” which in that context is a week of years, or seven years.
We also learn the duration of the seven-year time period of the Tribulation from the fact that half of the seven years is 3 ½ years, a figure that is stated several different ways. The Antichrist, also called the “beast,” and the “little horn,” makes a covenant with Israel for the “week,” (seven years), but in the middle of the seven years he breaks the covenant and comes to power. He is in power for “a time, times, and half a time,” that is, “a year, [two] years, and half a year” (Dan. 7:25; 12:7; Rev. 12:14). That same time period is also recorded as “42 months” (Rev. 11:2; 13:5) and 1,260 days (Rev. 12:6). All these time periods equal 3 ½ years.
At the end of the seven-year Tribulation, Jesus Christ fights and wins the Battle of Armageddon and conquers the earth. Then, he sends out his angels all over the earth to gather the survivors of the Tribulation and Armageddon (Matt. 24:30-31; 25:31-32). That would be no small task just by itself, but to complicate matters, at that same time the First Resurrection will occur (Rev. 20:4-6). The First Resurrection is also called the “Resurrection of the Righteous” (Luke 14:14; Acts 24:15), and the “Resurrection of Life” (John 5:29).
In the First Resurrection, all the righteous dead from Adam to Pentecost come to life. Millions of people will suddenly be raised from the dead (cp. Isa. 26:19; Ezek. 37:12-14; Dan. 12:2; Hos. 13:14). All these people will need to receive their rewards for their godly works on earth (Matt. 16:27), and they will need to be organized and shown what to do and where to go. Jesus does not do the judging alone, he will have help with the judging and rewarding of all these people. There are spirit being “elders” who have authority to judge who will be helping him, and those elders are associated with the First Resurrection (Rev. 20:4. Cp. Rev. 4:4, Dan. 7:10, 26).
We must also keep in mind that every person in the First Resurrection is saved. The unsaved are in the Second Resurrection (Rev. 20:12-15). The First Resurrection is to raise and reward people who are saved. After the judging and rewarding of the people in the First Resurrection, the Israelites will go back to the land of Israel (Ezek. 37:12, 14), while the Gentile nations will be disbursed to places around the earth, likely to where they came from (this explains how it is that during the Millennium, the nations come to Israel to worship).
It is easy to imagine that after the carnage of the Tribulation and Armageddon, and with the added activity of trying to organize, reward, and disperse all the righteous dead who have come to life, it will take 30 days to gather all the Tribulation survivors and prepare the Sheep and Goat Judgment (Matt. 25:31-46). The Sheep and Goat Judgment is different from the First Resurrection because it involves both saved people (the “sheep”) and unsaved people (the “goats”). The 1,260 days that are the last half of the Tribulation are extended by 30 days in part to gather all the survivors on earth and get the Sheep and Goat Judgment ready. This all becomes even clearer when we read Daniel 12:12, which says, “Blessed is the one who waits for, and reaches the 1,335 days.” Thus, Daniel 12:12 adds another 45 days to the 1,290 days of Daniel 12:11.
There is little doubt, given the context and scope of Scripture, that the 45 days after the 1,290 days are the 45 days of the Sheep and Goat Judgment of Matthew 25:31-46, and that anyone who was still alive and on earth after the 45 days was “blessed” because he or she was judged to be a “sheep” and allowed to enter the Millennial Kingdom of Jesus Christ, while those who did not make the 1,335 days were judged to be “goats” and were thrown into the Lake of Fire.