In Revelation 11 and 12, John mentions 1,260 days in two prophecies concerning another persecution of the Jews during the end times. Daniel 8 speaks of 2,300 days in a prophecy concerning a persecution of the Jewish people during the intertestamental period.
Daniel's prophecy has been fulfilled. Daniel predicts the actions of Antiochus Epiphanes, and John predicts those of the Antichrist.
The 1,260-day prophecy is found in two passages in Revelation. First, Revelation 11:2–3 says,
“The Gentiles will trample on the holy city for 42 months.
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The time period covered, 1,260 days, figures to 42 months, or 3 1/2 years.
The 42 months refers to the reign of the Antichrist, specifically, the last half (3 1/2 years of tribulation. At the beginning of that time, the Antichrist will break his covenant with Israel and set up “the abomination that causes desolation” (Mark 13:14; cf. Daniel 9:27)—an act that links the Antichrist to Antiochus Epiphanes, who similarly defiled the temple.