This cache has been out for awhile, by the long count calendar. It's constructed to make it until December 21st, 2012 - after which I suppose it should be archived as a new cycle will begin.
Looking for this two stage multi is more like embarking on a relatively short archaeological expidition. You'll need to be able to search and interpret glyphs like Indiana Jones. A little familiarity with appropriate mathematic principles might be helpful as well.
8/11/2011: after a couple DNF's, I went looking for my cache myself. I haven't been there in quite some time and it turns out I couldn't find stage 1 . . . . so until I get it fixed up, I'll just show you what it said:
