ISO 8601: Difference between revisions
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[[Category:ISO standard]] | |||
ISO 8601:2004 is a standard having the name "Data elements and interchange formats — Information interchange — Representation of dates and times". [http://www.iso.org/iso/catalogue_detail?csnumber=40874] | |||
[[tango.info]] uses the international date and time format as defined by [[w:ISO 8601]]. This eliminates ambiguities, makes searching the site and sorting dates easier. | |||
==Date== | |||
A standard date format looks like: '''2006-05-01''' | |||
Examples for non standard local formats: | |||
*01/05/06 (does it mean 2001-05-06 or 2006-01-05 or 2006-05-01?) | *01/05/06 (does it mean 2001-05-06 or 2006-01-05 or 2006-05-01?) | ||
*1.5.06 | *1.5.06 | ||
| Line 11: | Line 14: | ||
*1.5.2006 | *1.5.2006 | ||
==Time== | |||
Time is always written like '''21:30'''. Time intervals should be represented like '''21:30--23:45'''. | |||
==Intervals== | |||
Intervals are represented by start point and end point, seperated by "--". The ISO standard recomends "/" but allows "--" as a seperator. Because "--" can be used in filenames, tango.info prefers this. | |||
===Examples for date intervals=== | |||
* '''2007-06-25--26''' -> start: 2007-06-25 end 2007-06-26 (two days) | |||
* '''2007-06-25--29''' -> start: 2007-06-25 end: 2007-06-29 (five days) | |||
* '''2007-06-25--07-01''' -> start: 2007-06-25 end: 2007-07-01 (seven days, touching two monthes) | |||
* '''2007-12-30--2008-01-02''' -> start: 2007-12-30 end: 2008-01-02 (four days, touching two monthes and two years.) | |||
===Examples for time intervals=== | |||
Time intervals should be represented like '''21:30--23:45'''. | |||
===Examples for datetime intervals=== | |||
Datetime interval could be written like: '''2008-09-26 20:00--22:00''' | |||
==Repeating intervals== | |||
* | *http://en.wikipedia.org/wiki/ISO_8601#Repeating_intervals | ||
* | *defined in the standard in section 4.5 Recurring time interval | ||
* | **Number of repetitions (optional) from 1 to unbounded | ||
**plus one of the following | |||
***a) start point and end point | |||
***b) duration and context | |||
***c) start point and duration | |||
***d) duration and end point | |||
* tango.info would use c). Example with unbounded repetition: | |||
** R--2008-01-01T14:30--16:00 | |||
** how to define when an event is repeated? | |||
== | ==Links== | ||
*http://www.cl.cam.ac.uk/~mgk25/iso-time.html | *http://isotc.iso.org/livelink/livelink/4021199/ISO_8601_2004_E.zip?func=doc.Fetch&nodeid=4021199 | ||
*http://www.cs.tut.fi/~jkorpela/iso8601.html | *http://www.cl.cam.ac.uk/~mgk25/iso-time.html - Markus Kuhn | ||
*http://www.cs.tut.fi/~jkorpela/iso8601.html - Jukka Korpela | |||
*http://www.w3.org/TR/NOTE-datetime | *http://www.w3.org/TR/NOTE-datetime | ||
Latest revision as of 2018-08-04T16:13:01
ISO 8601:2004 is a standard having the name "Data elements and interchange formats — Information interchange — Representation of dates and times". [1]
tango.info uses the international date and time format as defined by w:ISO 8601. This eliminates ambiguities, makes searching the site and sorting dates easier.
Date
A standard date format looks like: 2006-05-01
Examples for non standard local formats:
- 01/05/06 (does it mean 2001-05-06 or 2006-01-05 or 2006-05-01?)
- 1.5.06
- 1/5/2006
- 5/1/2006
- 1.5.2006
Time
Time is always written like 21:30. Time intervals should be represented like 21:30--23:45.
Intervals
Intervals are represented by start point and end point, seperated by "--". The ISO standard recomends "/" but allows "--" as a seperator. Because "--" can be used in filenames, tango.info prefers this.
Examples for date intervals
- 2007-06-25--26 -> start: 2007-06-25 end 2007-06-26 (two days)
- 2007-06-25--29 -> start: 2007-06-25 end: 2007-06-29 (five days)
- 2007-06-25--07-01 -> start: 2007-06-25 end: 2007-07-01 (seven days, touching two monthes)
- 2007-12-30--2008-01-02 -> start: 2007-12-30 end: 2008-01-02 (four days, touching two monthes and two years.)
Examples for time intervals
Time intervals should be represented like 21:30--23:45.
Examples for datetime intervals
Datetime interval could be written like: 2008-09-26 20:00--22:00
Repeating intervals
- http://en.wikipedia.org/wiki/ISO_8601#Repeating_intervals
- defined in the standard in section 4.5 Recurring time interval
- Number of repetitions (optional) from 1 to unbounded
- plus one of the following
- a) start point and end point
- b) duration and context
- c) start point and duration
- d) duration and end point
- tango.info would use c). Example with unbounded repetition:
- R--2008-01-01T14:30--16:00
- how to define when an event is repeated?