Date: Mon, 29 Sep 1997 19:28:32 -0400 (EDT) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: Wolfgang Helbig <helbig@Informatik.BA-Stuttgart.DE> Cc: wollman@khavrinen.lcs.mit.edu (Garrett Wollman), current@FreeBSD.ORG Subject: Re: Adding algorithms [Was: cvs commit: src/usr.bin/cksum crc32.c ...] Message-ID: <199709292328.TAA13519@khavrinen.lcs.mit.edu> In-Reply-To: <199709292147.XAA05359@rvc1.informatik.ba-stuttgart.de> References: <199709281357.JAA08605@khavrinen.lcs.mit.edu> <199709292147.XAA05359@rvc1.informatik.ba-stuttgart.de>
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<<On Mon, 29 Sep 1997 23:47:32 +0200 (MET DST), Wolfgang Helbig <helbig@Informatik.BA-Stuttgart.DE> said:
>> ISO 8601. The strftime(3) function already provides this
>> functionality, although there is unfortunately no direct
>> iso8601weeknumber() function to give you the integer value directly.
> Unfortunately strftime(3)'s notion of week number only comes close
> to DIN 1355:
> [ISO 9899 quotation deleted]
UTSL.
case 'V':
/*
** From Arnold Robbins' strftime version 3.0:
** "the week number of the year (the first
** Monday as the first day of week 1) as a
** decimal number (01-53). The method for
** determining the week number is as specified
** by ISO 8601 (to wit: if the week containing
** January 1 has four or more days in the new
** year, then it is week 1, otherwise it is
** week 53 of the previous year and the next
** week is week 1)."
** (ado, 5/24/93)
*/
/*
** XXX--If January 1 falls on a Friday,
** January 1-3 are part of week 53 of the
** previous year. By analogy, if January
** 1 falls on a Thursday, are December 29-31
** of the PREVIOUS year part of week 1???
** (ado 5/24/93)
*/
/*
** You are understood not to expect this.
*/
{
int i;
I believe that more recent versions of this code also provide a
conversion to match the ISO 8601 year-of-week, but our current version
doesn't. (I once made a stab at updating ours, but the locale code
has changed too much.)
-GAWollman
--
Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same
wollman@lcs.mit.edu | O Siem / The fires of freedom
Opinions not those of| Dance in the burning flame
MIT, LCS, CRS, or NSA| - Susan Aglukark and Chad Irschick
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