ISO 8601

The Best Of Dates, The Worst Of Dates
Just because Y2K is over, doesn't mean programmers are done creating date bugs - covers many date and time issues, especially ISO 8601 - by Gilbert Healton.
http://www.exit109.com/~ghealton/y2k/yrexamples.html

Calculating the ISO week number - by Jan Stout.
WeekNumber Calculation Explanation.
http://www.proesite.com/timex/wkcalc.htm

Changing Your Operating System's Default Date Format
Changing your operating system's default date format to use four-digit years - University of California at Berkeley.
http://y2k.berkeley.edu/computers/fixpcs/issues/os-date-format.html

The Code Project: C# Programming
Free source code and tutorial for a Gregorian Date To ISO Date Converter for Windows.
http://www.thecodeproject.com/csharp/GregToISO.asp

Date and Time Notation - Macintosh Procedure for ISO 8601 Format
Setting up your Mac to use the Year-Month-Day date format. Instructions are for MAC OS 7, but are easily adapted for later versions.
http://metric1.org/macdtset.htm

Date and Time Notation - Windows Procedure for ISO 8601 Format
Setting up your PC to use the Year-Month-Day date format. Instructions are for Windows 95, but are easily adapted for later versions.
http://metric1.org/windtset.htm

Date and Time on the Internet
A proposal to use the ISO date format for Internet applications - by Chris Newman.
http://www.hermetic.ch/cal_stud/newman.htm

Date and Time on the Internet - Timestamps
Document: draft-ietf-impp-datetime-05 - An updated proposal to use a limited subset of ISO-compliant date formats for date stamps on the Internet - by Chris Newman.
http://community.roxen.com/developers/idocs/drafts/draft-ietf-impp-datetime-05.txt

Date and Time on the Internet: Timestamps
RFC 3339 defines a date and time format for use in Internet protocols that is a profile of the ISO 8601 standard for representation of dates and times using the Gregorian calendar - by Graham Klyne and Chris Newman [FTP].
http://tools.ietf.org/html/rfc3339

Date and Time: Week Numbers
Windows date and time locale tables sorted both by country order and by definition order - by Peter J Haas in Germany.
http://www.pjh2.de/datetime/weeknumber/index.php

Dated Material - Is the Y2K Problem Really Over?
Discussion about the use and misuse of various date formats - Intelligent Enterprise Magazine - Celko.
http://www.intelligententerprise.com/000717/celko.shtml?database

Delphi 32 - Components: Date & Time: Clocks - ISO Week Number (Program Code)
Here's some code that generates the weeknumber for a given date in accordance with ISO standard 8601:1988 (European Standard EN 28601).
http://www.delphi32.com/vcl/3136/

Discussion About the ISO 8601 Standard
About 200 people worldwide, who already use and promote the ISO 8601 Year-Month-Day date format have formed this discussion group. Go here for help and advice, or for general discussion. Message archive can be browsed. If you wish to join in, there are options to participate via the Web-based front-end, or subscribe via email.
http://groups.yahoo.com/group/iso8601/

Implementation of the ISO 8601 Standard
A list of countries around the world that have adopted the ISO 8601 standard, also lists equivalent national standards numbers where applicable.
http://www.qsl.net/g1smd/isoimp.htm

Information on ISO 8601, the date and time representation standard
A short description of and motivation for ISO 8601, the date and time representation standard, with links to more detailed resources - by Jukka Korpela in Finland.
http://www.cs.tut.fi/~jkorpela/iso8601.html

International Date Format Campaign
Describes and lists many reasons why the ISO 8601 standard should be more widely adopted in Computing, on the Internet, and in everyday life - by Steve Adams in England.
http://www.saqqara.demon.co.uk/datefmt.htm

ISO 8601
A short introduction to the ISO 8601 format.
http://www.cezwright.com/theWeb/y2k/iso_8601.htm

ISO 8601 compliant website button
A button to place on an iso-8601 compliant website.
http://www.esperanto.uklinux.net/iso8601/iso8601.html

ISO 8601 Date and Time - Converting and Implementing
How to implement the use of the Year-Month-Day Date format in various computer systems - includes some programming examples and the 'Date Format Poll' - by Nikolai Sandved in Norway.
http://www.probabilityof.com/ISO8601.shtml

ISO 8601 Date/Time Representations
A simple introduction to ISO 8601 date and time formats - University of Wellington in New Zealand.
http://www.mcs.vuw.ac.nz/technical/software/SGML/doc/iso8601/ISO8601.html

ISO 8601: the Right Format for Dates
A short description, and guide to usage, of the ISO 8601 format, with some links to further resources.
http://www.uic.edu/depts/accc/software/isodates/index.html

The ISO Date Format
Discussion of formats for expressing dates, with particular reference to the ISO 8601 date format - by Peter Meyer.
http://www.hermetic.ch/cal_stud/formats.htm

ISO note on the standard
Brief description of the standard from the publishers themselves.
http://www.iso.org/iso/en/prods-services/popstds/datesandtime.html

ISO Week Algorithm
An algorithm for converting Gregorian Calendar Dates to the ISO 8601 Week Date format (Y2K Compliant).
http://personal.ecu.edu/mccartyr/ISOwdALG.txt

The ISO Week Date Calendar
A calendar of weeks based on the ISO 8601 week notation - convert any date into week number and day number.
http://www.personal.ecu.edu/mccartyr/isowdcal.html

Issues about Date and Time
by Clive D.W. Feather.
http://www.davros.org/c/wg14n764.txt

Javascript Code
Parsing ISO 8601 Date/Times in JavaScript.
http://delete.me.uk/2005/03/iso8601.html

Mac OS X 10.0: How to Set Date and Time to ISO 8601:1988 Standard
Apple support document.
http://docs.info.apple.com/article.html?artnum=106174

The Many Dates and Times of Perl
A tour of the many date and time handling modules on the CPAN - by Dave Rolsky.
http://www.perl.com/pub/a/2003/03/13/datetime.html

The Mathematics of the ISO 8601 Calendar
A comprehensive document covering how week numbers are calculated using the ISO 8601 calendar system. Includes links to many further resources.
http://www.phys.uu.nl/~vgent/calendar/isocalendar.htm

New Date
A private site about the advantages of using ISO 8601-style dates.
http://www.wwmeli.org/newdate/

Problem F - Standard Dates (50 Points)
A problem set for computer studies students involving programming using the ISO 8601 date format.
http://www.cs.waikato.ac.nz/~marku/progcomp/problems/problemF.html

Project 2038 FAQ
Description of computer problems with date/time calculations coming in year 2038.
http://maul.deepsky.com/%7Emerovech/2038.html

Schema Time Changes (Draft)
Useful information about date and time - by M. Davis.
http://www.macchiato.com/unicode/timeIntervals.htm

Standards for Representing Dates
Useful overview and discussion on adopting ISO standards and four-digit year formats as part of Y2K readiness and future-proofing of software - University of California at Berkeley.
http://y2k.berkeley.edu/computers/fixpcs/issues/date-standards.html

Standards to be obeyed by the masses: Representing temporal and monetary data on the web
A well researched paper into the usage of various Date and Time, and Monetary, formats on the Internet which recommends the widespread adoption of ISO 3166, ISO 4217, and ISO 8601 - by Gerhard Knolmayer. [PDF]
http://dialspace.dial.pipex.com/town/square/xta78/ISO8601/Knolmayer.pdf

UN/ECE Trade Facilitation Recommendation 07
The United Nations Economic Commission for Europe - Working Party on Facilitation of International Trade Procedures - Recommendation 07 - Numerical Representation of Dates, Time and Periods of Time. [PDF]
http://www.unece.org/etrades/unedocs/e_forms/rec_pdf/rec07_1988_inf108.pdf

Use International Date Format
How and why to use international date format in your document - from the W3C QA section.
http://www.w3.org/QA/Tips/iso-date

Use ISO 8601 and Drop mm/dd/yy and am/pm
Justin JIH, a Taiwanese American, sets out the reasons why adopting the YYYY-MM-DD date format is preferred. Includes useful links to further resources.
http://www.geocities.com/jusjih/iso8601.html

Using ISO 8601 Dates
ISO 8601 Dates: What they are and why they're good - University of Illinois at Chicago in the USA.
http://www.uic.edu/depts/accc/software/isodates/isocontents.html

Various Date and Time Format Miscellany
by J R Stockton - Covers written date and time formats, ISO Standard 8601 (with links) and converting to and from Roman Numbers. Discusses reforming American format dates as well as JavaScript and non-text formats.
http://www.merlyn.demon.co.uk/datefmts.htm

W3C Date and Time Formats
Defines a profile of ISO 8601 referenced by the W3C HTML recommendation.
http://www.w3.org/TR/1998/NOTE-datetime-19980827

W3C I18N Q&A: Date formats
Discussion of date formats for internationalisation.
http://www.w3.org/International/questions/qa-date-format

Week Numbers In Excel
How to calculate absolute week numbers, Excel week numbers and ISO week numbers (with Formula and VBA). Links to other ISO 8601 related materials.
http://www.cpearson.com/excel/weeknum.htm

54 Weeks in 2000 : Another Y2K Problem!
A short discussion about week numbering, showing how the ISO 8601 standard had fixed a Y2K problem, long before it was noticed in other non-ISO week-numbering schemes.
http://www.allegro.com/papers/54.html

The Y2K Problem, UIC, and You
Describes Year 2000 fixes for computer systems, mainly based on using the ISO 8601 standard for dates.
http://www.uic.edu/depts/accc/newsletter/adn21/y2kprob.html