According to http://www.ebiblefellowship.com/outreach/tracts/may21/
2011 AD—On May 21st, Judgment Day will begin and the rapture (the taking up into heaven of God’s elect people) will occur at the end of the 23-year great tribulation. On October 21st, the world will be destroyed by fire (7000 years from the flood; 13,023 years from creation).