recurringDate

Standard excerpt:

recurringDate is a date that recurs, specifically a day of the year such as the third of May. Arbitrary recurring dates are not supported by this datatype. The value space of recurringDate is the set of calendar dates, as defined in 3 of [ISO 8601]. The base type of recurringDate is recurringDuration. recurringDate is generated from recurringDuration by setting the value of the duration facet equal to "PT24H" (24 hours) and the value of the period facet to "P1Y" (one year).

Examples: