End of the world "calculations" There have been many "calculations" done by various people from various Christian denominations concerning the precise date of the end of the world, like Harold Camping and 21st of May 2011. Despite those numerous instances of people figuring out the time this event was to occur, I can't find any sources to the exact math behind such claims.

Are there any resources like that available anywhere so one could verify such math and find out the flaws of the "scientific" reasoning behind them? If those are available, have they been revealed before the predicted date was to occur?
The difficulty in verifying the math and the calculations is that every prognostication has its own formula.  In order to verify Harold Camping, for instance, you have to look at the passages he is pulling from.

For example, here is one (and I don't endorse it) showing how they arrive at their numbers.

Probably the most important calculations revolve around the "time, times, and half a time" in Revelation, and the vision of the 70 weeks in Daniel.

There is one mathematical construct in the Bible that bears the most weight, however, and that is Matthew 24:36:


  But concerning that day and hour no one knows, not even the angels of heaven, nor the Son, but the Father only