Go to standard recurringDuration
Standard excerpt:
recurringDuration represents a timeDuration that recurs with a specific timeDuration starting from a specific origin. The order-relation on timeDuration is: x < y iff y - x is positive. A single lexical representation, which is a subset of the lexical representations allowed by [ISO
8601], is allowed for recurringDuration. This lexical representation is the [ISO 8601] extended
format CCYY-MM-DDThh:mm:ss.sss where "CC" represents the century, "YY" the year, "MM"
the month and "DD" the day, preceded by an optional leading sign to indicate a negative
number. If the sign is omitted, "+" is assumed. The letter "T" is the date/time separator and "hh",
"mm", "ss.sss" represent hour, minute and second respectively. Additional digits can be used to
increase the precision of fractional seconds if desired. To accommodate year values greater
than 9999 additional digits can be added to the left of this representation.
This representation can be immediately followed by a "Z" to indicate Coordinated Universal
Time. To indicate the time zone, i.e. the difference between the local time and Coordinated
Universal Time, the difference immediately follows the time and consists of a sign, + or -,
followed by hh:mm.
Examples: