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ISO 8601

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


Microformats using ISO8601 include:


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).


  • Should we restrict microformats' use of ISO 8601 to RFC 3339 values? Andy Mabbett
  • How should dates before the common era be marked up? Andy Mabbett

See also

Related pages