We've been talking about 360 day calendars in another thread. Apparently, they were used in Egypt, India, Sumeria and all over the Middle East until the 8th century.
In my research, I also discovered that the one of the prophecies in Revelations is based on the 360 day calendar:
http://www.360calendar.com/bible-prophe ... edited.htm
They will trample on the holy city for 42 months. And I will give power to my two witnesses, and they will prophesy for 1260 days, clothed in sackcloth," (Rev. 11:2b,3).
They are saying 42 months because that equals 1260 days, which is three and a half years. This fits with the two other mentions of three and a half years which is described as "time, and times and half a time" in both the book of Revelations and the post-exilic Daniel:
"The woman fled into the desert to a place prepared for her by God, where she might be taken care of for 1260 days...And there were given to the woman the two wings of the great eagle, that she might fly into the wilderness unto her place, where she is nourished for a time, and times, and half a time, from the face of the serpent." (Rev. 12:6, 14).
"The man clothed in linen, who was above the waters of the river, lifted his right hand and his left hand toward heaven, and I heard him swear by him who lives forever, saying, "It will be for a time, times and half a time.* When the power of the holy people has been finally broken, all these things will be completed," (Daniel 12:7).
But in Daniel, they throw in an intercalary month:
The N.I.V.'s interpretation of "time, times and half a time" as '3-½ years' is obviously correct since this phrase is paralleled with the number "1290 days," found only four verses later in the same chapter, (1290 days equals 3-½ years):
"From the time that the daily sacrifice is abolished and the abomination that causes desolation is set up, there will be 1290 days. Blessed is the one who waits for and reaches the end of the 1335 days," (Dan. 12:11-12).
So I wonder why Revelations used a 360 day calendar. Would this not indicate that it must have been composed pre 8th century BC, when calendars all over the world switched to 365 days?