It has been assumed in traditional eschatological writings and discussions that the battle of Armageddon unfolds at the end of the “70th week of Daniel.” This wrong conclusion resulted from a misunderstanding of the timing of Antichrist’s destruction, the last trumpet and the bowls in Revelation, as well as ignoring Daniel’s teaching that there is a 75 day period that follows after the 7 years. This 75-day time frame is divided into a 30 day period followed by a 45 day period.
11 And from the time that the regular burnt offering is taken away and the abomination that makes desolate is set up, there shall be 1,290 days. 12 Blessed is he who waits and arrives at the 1,335 days. 13 But go your way till the end. And you shall rest and shall stand in your allotted place at the end of the days.” Daniel 12:11-13
This 75 day period has important events unfolding within it, including the battle of Armageddon happening 30 days into it. Follow Charles Cooper here as he exegetically demonstrates this.