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ISO 8601

The International Standards Organisation' standard, number 8601 is an international standard for date and time representations. It is used for all date-time representations in microformats.


For a plain-language overview of ISO 8601, we recommend the ISO 8601 summary by Markus Kuhn

RFC 3339

RFC 3339 defines a profile of ISO 8601 for the use in Internet protocols and standards. It explicitly excludes durations and dates before the common era. The more complex formats like week numbers and ordinal day are not permitted (see RFC 3339, section 5.6).


See also

iso-8601 was last modified: Wednesday, December 31st, 1969