If the calendar is off a month, around December 1 would be the day Noah entered the ark and then the 17th day of the month when the flood started would be around December 8.
If we go past those dates, I am watching the new moon in December. This video shows the calendar being off one month (15min mark) and also shows the sun (bridegroom) and moon (bride) entering the golden gate on the new moon of December 19 (57min mark). In a video a couple years ago, Craig Bong said that Josephus placed Feast of Trumpets in December on a new moon and learned from Chuck Missler that the Journey of the souls and opening of the gates of heaven was connected...at the 1 hour 2min mark in the 2nd video below.
He is mostly done talking about the calendar and rapture typology by 1:22. After that he talks about speaking in tongues so if you are opposed to that it would be a good time to turn it off. His date is 12-21 which he thinks is the new moon.
