Re: CCAT: TIME: Fantasyland?/Various issues

phayes@cs.uiuc.edu (Pat Hayes)
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Date: Mon, 17 Oct 1994 17:47:50 -0600
To: dwig@markv.com, Fritz Lehmann <fritz@rodin.wustl.edu>
From: phayes@cs.uiuc.edu (Pat Hayes)
Subject: Re: CCAT: TIME: Fantasyland?/Various issues
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>To Pat's call for actual concepts, here are some recurrences my personal
>organizer tool (Ecco, from Arabesque software) supports: "every Tuesday",
>"2nd Tuesday of every month", "11th of every month", "every Oct. 11th",
>"every Nth Tuesday", "last business day of every month".  Also, in place of
>"every month" you can specify "every Nth month".
>
>Finally, here's the definition for the date of Easter: "the first Sunday
>after the first full moon after the vernal equinox".  I seem to remember
>similar definitions of Islamic dates.
>
Great! Thanks, thats just the kind of thing I wanted. I think these are all
definable, but it will take work.

Hres a further question. What kind of relations between these concepts are
important? For example, the 12th of every month follows, in a sense, the
11th of every month. Is this significant? Or do you just want to be able to
keep track of particular dates and times?

pat


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