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Non-Gregorian Recurrence Rules in the Internet Calendaring and Scheduling Core Object Specification (iCalendar) (RFC7529)

IP.com Disclosure Number: IPCOM000241463D
Original Publication Date: 2015-May-01
Included in the Prior Art Database: 2015-May-02
Document File: 42 page(s) / 43K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Daboo: AUTHOR [+2]

Abstract

The iCalendar [RFC5545] data format is in widespread use to represent calendar data. iCalendar represents dates and times using the Gregorian calendar system only. It does provide a way to use non- Gregorian calendar systems via a "CALSCALE" property, but this has never been used. However, there is a need to support at least non- Gregorian recurrence patterns to cover anniversaries, and many local, religious, or civil holidays based on non-Gregorian dates.

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Internet Engineering Task Force (IETF)                          C. Daboo Request for Comments: 7529                                    Apple Inc. Updates: 5545, 6321, 7265                                    G. Yakushev Category: Standards Track                                    Google Inc. ISSN: 2070-1721                                                 May 2015

      Non-Gregorian Recurrence Rules in the Internet Calendaring and             Scheduling Core Object Specification (iCalendar)

Abstract

   This document defines extensions to the Internet Calendaring and    Scheduling Core Object Specification (iCalendar) (RFC 5545) to    support use of non-Gregorian recurrence rules.  It also defines how    Calendaring Extensions to WebDAV (CalDAV) (RFC 4791) servers and    clients can be extended to support these new recurrence rules.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc7529.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    (http://trustee.ietf.org/license-info) in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

Daboo & Yakushev             Standards Track                    [Page 1]
 RFC 7529               iCalendar RSCALE Extension               May 2015

 Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2

   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3

   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   4

   4.  Extended RRULE Property . . . . . . . . . . . . . . . . . . .   6

     4.1.  Skipping Invalid Dates  . . . . . . . . . . . . . . ....