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Calendrical Calculations Edward M. Reingold, Nachum Dershowitz
Publisher: Cambridge University Press

Many are calculations relating to the Maya calendar. Calendar calculations with…Calculator! For example, November 1 plus 3 weeks is date -j -v+3w -f"%m/%d/%y" "11/01/10". Calendrical Calculations: Third Edition - Nachum Dershowitz and Edward M. I always end up learning something in the process. It's a function - but the basic idea is that you need to know the number of calendar days between the start and end of the task. Calendrical calculations are, more than those in other areas, encrusted in ancient lore and antiquated methods. Such anachronisms were the motivation for Dershowitz and Reingold to write Calendrical Calculations. These appear to be notations, written by the scribes as they were working and carrying out calendrical calculations, similar to a modern mathematician's office whiteboard. Unfortunately, you can't do a simple Excel-like calculation. The date command will do much of this for you. Because I find calendrical calculations interesting, I write posts debunking these odd ideas when I run across them. I am living proof that old dogs can learn new tricks. Did you know that the lowly Calcualtor built into Windows can do some basic date calculations?