RFC 5545, "Internet Calendaring and Scheduling Core Object Specification (iCalendar)", September 2009

Note: This RFC has been updated by RFC 5546, RFC 6868, RFC 7529, RFC 7953, RFC 7986, RFC 9073, RFC 9074, RFC 9253

Errata ID: 8398
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Nicco Kunzmann
Date Reported: 2025-04-29

Section 3.6.5 says:

       tzprop     = *(
                    ;
                    ; The following are REQUIRED,
                    ; but MUST NOT occur more than once.
                    ;
                    dtstart / tzoffsetto / tzoffsetfrom /
                    ;
                    ; The following is OPTIONAL,
                    ; but SHOULD NOT occur more than once.
                    ;
                    rrule /
                    ;
                    ; The following are OPTIONAL,
                    ; and MAY occur more than once.
                    ;
                    comment / rdate / tzname / x-prop / iana-prop
                    ;
                    )

It should say:

       tzprop     = *(
                    ;
                    ; The following are REQUIRED,
                    ; but MUST NOT occur more than once.
                    ;
                    dtstart / tzoffsetto / tzoffsetfrom /
                    ;
                    ; The following is OPTIONAL,
                    ; but SHOULD NOT occur more than once.
                    ;
                    rrule /
                    ;
                    ; The following are OPTIONAL,
                    ; and MAY occur more than once.
                    ;
                    comment / exdate / rdate / tzname / x-prop / iana-prop
                    ;
                    )

Notes:

This proposal adds exdate to STANDARD and DAYLIGHT

tzprop does not include "exdate"
However, the exdate documentation states:

Conformance: This property can be specified in recurring "VEVENT",
"VTODO", and "VJOURNAL" calendar components as well as in the
"STANDARD" and "DAYLIGHT" sub-components of the "VTIMEZONE"
calendar component.

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