The wonderful world of week number standards / 2013-12-30

2013-12-30 The wonderful world of week number standards 7 years ago
The wonderful thing about standards:
$ date "+%u %w %U %V %W"
1 1 52 01 52
And the explanations:

%u day of week (1..7); 1 is Monday

%w day of week (0..6); 0 is Sunday

%U week number of year, with Sunday as first day of week (00..53)

%V ISO week number, with Monday as first day of week (01..53)

%W week number of year, with Monday as first day of week (00..53)

And it's easy to find days with 3 different week numbers:
31 dec 1990 is 52 01 53
03 jan 1993 is 01 53 00
02 jan 1994 is 01 52 00
01 jan 1995 is 01 52 00
30 dec 1996 is 52 01 53
31 dec 1996 is 52 01 53
03 jan 1999 is 01 53 00
02 jan 2000 is 01 52 00
02 jan 2005 is 01 53 00
01 jan 2006 is 01 52 00
31 dec 2007 is 52 01 53
03 jan 2010 is 01 53 00
02 jan 2011 is 01 52 00
01 jan 2012 is 01 52 00
03 jan 2016 is 01 53 00
01 jan 2017 is 01 52 00
31 dec 2018 is 52 01 53
03 jan 2021 is 01 53 00
02 jan 2022 is 01 52 00
01 jan 2023 is 01 52 00
30 dec 2024 is 52 01 53
31 dec 2024 is 52 01 53
03 jan 2027 is 01 53 00
02 jan 2028 is 01 52 00
31 dec 2029 is 52 01 53
Calendering software, including the one from a software developer quite known for not following standards has converged on the ISO week number.

Tags: , ,

IPv6 check

Running test...
, reachable as koos+website@idefix.net. PGP encrypted e-mail preferred. PGP key 5BA9 368B E6F3 34E4 local copy PGP key 5BA9 368B E6F3 34E4 via keyservers

RSS
Meningen zijn die van mezelf, wat ik schrijf is beschermd door auteursrecht. Sommige publicaties bevatten een expliciete vermelding dat ze ongevraagd gedeeld mogen worden.
My opinions are my own, what I write is protected by copyrights. Some publications contain an explicit license statement which allows sharing without asking permission.
Other webprojects: Camp Wireless, wireless Internet access at campsites, The Virtual Bookcase, book reviews
This page generated by $Id: newsitem.cgi,v 1.54 2020/12/31 15:36:31 koos Exp $ in 0.005244 seconds.