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Re: Week number
From: |
Harald Hanche-Olsen |
Subject: |
Re: Week number |
Date: |
Wed, 15 Oct 2008 23:28:23 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (berkeley-unix) |
+ Xavier Maillard <xma@gnu.org>:
> I compared the results of your function and the result from a
> simple (format-time-string "%W") for the current date and I got
> week 42 for the former and week 41 for the latter. Can you
> explain this ?
There are different ways to count week numbers. You can bet that any
function having -iso- in its name will use ISO week numbering, which
corresponds to %V, not to %W. Here are the relevant bits from the
strftime man page on freebsd.
%U is replaced by the week number of the year (Sunday as the first day
of the week) as a decimal number (00-53).
%V is replaced by the week number of the year (Monday as the first day
of the week) as a decimal number (01-53). If the week containing
January 1 has four or more days in the new year, then it is week 1;
otherwise it is the last week of the previous year, and the next
week is week 1.
%W is replaced by the week number of the year (Monday as the first day
of the week) as a decimal number (00-53).
(Note also that the proper way to write the week the ISO way is %GW%V,
not %YW%V as you might think.)
--
* Harald Hanche-Olsen <URL:http://www.math.ntnu.no/~hanche/>
- It is undesirable to believe a proposition
when there is no ground whatsoever for supposing it is true.
-- Bertrand Russell
- Re: Week number, (continued)
- Re: Week number, Charles Sebold, 2008/10/14
- Re: Week number, Charles Sebold, 2008/10/14
- Re: Week number, Xavier Maillard, 2008/10/14
- Re: Week number, Charles Sebold, 2008/10/14
- Re: Week number, Peter Dyballa, 2008/10/14
- Re: Week number, Charles Sebold, 2008/10/14
- Re: Week number, Xavier Maillard, 2008/10/15
- Message not available
- Re: Week number, Charles Sebold, 2008/10/14
- RE: Week number, Drew Adams, 2008/10/14
- Re: Week number, Xavier Maillard, 2008/10/15
- Message not available
- Re: Week number,
Harald Hanche-Olsen <=