Try out our new RRULE tool for creating RRULE compatible strings.

Property Name

An IANA-registered property name

Value Type

The default value type is TEXT. The value type can be set to any value type.

Property Parameters

Any parameter can be specified on this property.


This specification allows other properties registered with IANA to be specified in any calendar components. Compliant applications are expected to be able to parse these other IANA- registered properties but can ignore them.

Format Definition

This property is defined by the following notation:

 iana-prop = iana-token *(";" icalparameter) ":" value CRLF


The following are examples of properties that might be registered to IANA:



This document was automatically converted to XHTML using an RFC to HTML converter with the original text document at the Internet Engineering Task Force web site at .  The original text document should be referred to if there are any errors or discrepancies found in this document.

Need to test your iCalendar feeds?

The iCalendar Validator provides developers and testers a method to validate their iCalendar feeds, which can take data from either a URL, file or text snippet and compare it against the RFC 5545 specification.  We believe we have one of the best iCalendar validation tools available on the internet. More information about the validator can be found here.