teidata.temporal.iso defines the range of attribute values expressing a temporal expression such as a date, a time, or a combination of them, that conform to the international standard Data elements and interchange formats – Information interchange – Representation of dates and times.
Moduletei — The TEI Infrastructure
Used by
Content model
  <dataRef name="date"/>
  <dataRef name="gYear"/>
  <dataRef name="gMonth"/>
  <dataRef name="gDay"/>
  <dataRef name="gYearMonth"/>
  <dataRef name="gMonthDay"/>
  <dataRef name="time"/>
  <dataRef name="dateTime"/>
  <dataRef name="token"

<rng:define name="teidata.temporal.iso">
  <rng:data type="date"/>
  <rng:data type="gYear"/>
  <rng:data type="gMonth"/>
  <rng:data type="gDay"/>
  <rng:data type="gYearMonth"/>
  <rng:data type="gMonthDay"/>
  <rng:data type="time"/>
  <rng:data type="dateTime"/>
  <rng:data type="token">
   <rng:param name="pattern">[0-9.,DHMPRSTWYZ/:+\-]+</rng:param>
teidata.temporal.iso =
 | xsd:gYear
 | xsd:gMonth
 | xsd:gDay
 | xsd:gYearMonth
 | xsd:gMonthDay
 | xsd:time
 | xsd:dateTime
 | token { pattern = "[0-9.,DHMPRSTWYZ/:+\-]+" }

If it is likely that the value used is to be compared with another, then a time zone indicator should always be included, and only the dateTime representation should be used.

For all representations for which ISO 8601 describes both a basic and an extended format, these Guidelines recommend use of the extended format.

While ISO 8601 permits the use of both 00:00 and 24:00 to represent midnight, these Guidelines strongly recommend against the use of 24:00.