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Re:Posical, the Positivist Calendar for Python by tylerneylon on Friday April 18, 2014 @07:37PM (#7611889)
Another mathematically elegant calendar is the 7date:

http://tylerneylon.com/a/7date_spec/

Re:Posical, the Positivist Calendar for Python by lsh on Friday April 18, 2014 @09:20PM (#7612159)
I really like the 7date notation with the base-7 notation counting the weeks down, but the 7month with the remaining 22/23 days of the year are still a kludge. With a 13 month calendar those remaining 1/2 days are neatly packaged and disposed of as "festival days". Harder to deal with 22/23 tailing days.