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

Property Name



This property defines the calendar scale used for the calendar information specified in the iCalendar object.

Value Type


Property Parameters

IANA and non-standard property parameters can be specified on this property.


This property can be specified once in an iCalendar object. The default value is "GREGORIAN". Description: This memo is based on the Gregorian calendar scale. The Gregorian calendar scale is assumed if this property is not specified in the iCalendar object. It is expected that other calendar scales will be defined in other specifications or by future versions of this memo.

Format Definition

This property is defined by the following notation:

 calscale   = "CALSCALE" calparam ":" calvalue CRLF

 calparam   = *(";" other-param)

 calvalue   = "GREGORIAN"


The following is an example of this property


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.