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Terminology: A Date property is not directly set via a parameter. Instead it is formed of constituent parts so that partial dates may be input.

The constituent parts are postpended to the event (eg: birth_year). The properties are:

  • year (if the property value is 9999, then the year is unknown)
  • month
  • day
  • hour
  • minute
  • if-bce


  • Background: This is a revision of the original date scheme in which constituent parts of dates were derived from full date fields. (eg date-y, date-m.) Those older properties are obsolete.

See also further explanation of rationale and discussion.

  • Type:Number
  • subproperty of (allows search on) Property:event date-m
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