From: Jude DaShiell <jdashiel@panix.com>
To: Jean Louis <bugs@gnu.support>
Cc: help-gnu-emacs@gnu.org
Subject: Re: even elder races get tired of waiting
Date: Sun, 21 Mar 2021 15:24:39 -0400 [thread overview]
Message-ID: <alpine.NEB.2.23.451.2103211516280.19720@panix1.panix.com> (raw)
In-Reply-To: <YFd+t83QzMUTJHx6@protected.localdomain>
Use of cal with a month number and a year number to get a weekday of a
particular date can make work a little easier.
This is for really long time periods and only inside the gregorian
calendar constraints since outside of those constraints things get really
wild as a result of compound errors.
With that weekday in mind subtracting a year when you won't land in a leap
year or adding a year when you won't land in a leap year, subtract or add
one weekday to get the correct weekday for that date in those years. If
you will land in a leap year, subtract or add two weekdays to get the
correct weekday. Modulus the weekday by 7 to keep it in whichever range
you prefer to use..
That can get you to the correct forest, then it's a matter of smaller
subtraction or addition within a year to get you your exact length.
next prev parent reply other threads:[~2021-03-21 19:24 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-20 20:37 even elder races get tired of waiting Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-21 14:01 ` Jean Louis
2021-03-21 14:19 ` Jean Louis
2021-03-21 15:12 ` Jude DaShiell
2021-03-21 17:10 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-21 17:29 ` Jean Louis
2021-03-21 17:38 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-22 7:21 ` Jean Louis
2021-03-21 22:30 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-22 7:48 ` Jean Louis
2021-03-22 18:29 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-22 19:10 ` Jean Louis
2021-03-22 19:47 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-22 20:31 ` Jean Louis
2021-03-22 21:33 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-22 21:40 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-22 22:43 ` Jean Louis
2021-03-22 23:34 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-22 23:38 ` Jean Louis
2021-03-22 23:52 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-22 8:42 ` Jean Louis
2021-03-22 18:31 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-22 19:21 ` Jean Louis
2021-03-21 17:13 ` Jean Louis
2021-03-21 19:24 ` Jude DaShiell [this message]
2021-03-21 22:34 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-03-22 7:54 ` Jean Louis
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