period for these beliefs is also based on other passages: in the Book of Daniel, "time, times, and half a time", interpreted as "three and a half years," and the Book of Revelation, "a thousand two hundred and threescore days" and "forty and two months" (the prophetic month averaging 30 days, hence 1260/30 = 42 months or 3.5 years). The 1290 days of Daniel 12:11, (rather than the 1260 days of Revelation 11:3), is thought to be the result of either a simple intercalary leap month adjustment, or due to further calculations related to the prophecy, or due to an intermediate stage of time that is to prepare the world for the beginning of the millennial reign. Events Among Futurists there are differing views about what will happen to Christians during the Tribulation: Pretribulationists believe that all righteous Christians (deceased and living) will be taken bodily up to Heaven (called the Rapture) before the Tribulation begins. According to this belief, every true Christian that has ever existed throughout the course of the entire Christian era will be instantaneously transformed into a perfect resurrected body, and will thus escape the trials of the Tribulation. Those who become Christians after the rapture will live through (or perish during) the Tribulation. After the Tribulation, Christ will return to establish his Millennial Kingdom. Prewrath Tribulationists believe the rapture will occur during the Tribulation, halfway through or after, but before the seven bowls of the wrath of God. Midtribulationists believe that the rapture will occur halfway through the Tribulation, but before the worst part of it occurs. The seven-year period is divided into halves—the "beginning of sorrows" and the "Great Tribulation". Posttribulationists believe that Christians will not be taken up into Heaven for eternity, but will be received or gathered in the air by Christ, to descend together to establish the Kingdom of God on earth at the end of the Tribulation. In pretribulationism and midtribulationism, the rapture and the Second Coming of Christ are separate events, while in post-tribulationism the two events are identical or simultaneous. Another feature of the pre- and mid-tribulation beliefs is the idea that after the rapture, Christ will return for a third time (when also counting the first coming) to set up his kingdom on the earth. The Catholic Church teaches that there will be a "final Passover" or last "purgatory" before the final parousia (Second Coming), in which