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Calendaring Extensions to WebDAV (CalDAV): Time Zones by Reference (RFC7809)

IP.com Disclosure Number: IPCOM000245720D
Original Publication Date: 2016-Mar-01
Included in the Prior Art Database: 2016-Apr-01
Document File: 26 page(s) / 29K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

C. Daboo: AUTHOR

Abstract

The CalDAV [RFC4791] calendar access protocol allows clients to access calendar data stored on a server in the iCalendar [RFC5545] data format. In iCalendar, calendar data that uses local time in any of its date and/or time values is specified as a date-time value in combination with a time zone identifier ("TZID" property parameter). The time zone identifier refers to a time zone definition (a "VTIMEZONE" component) that has all of the rules required to determine local-time UTC offsets for the corresponding time zone. In many cases, these "VTIMEZONE" components can be larger, octet-wise, than the events or tasks that make use of them. However, iCalendar currently requires all iCalendar objects ("VCALENDAR" components) that refer to a time zone via its identifier to also include the corresponding "VTIMEZONE" component. This leads to inefficiencies in the CalDAV protocol because large amounts of "VTIMEZONE" data are continuously being exchanged, and for the most part these time zone definitions are unchanging. This is particularly problematic for mobile or limited devices, with limited network bandwidth, CPU, and energy resources.

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Internet Engineering Task Force (IETF)                          C. Daboo Request for Comments: 7809                                         Apple Updates: 4791                                                 March 2016 Category: Standards Track ISSN: 2070-1721

    Calendaring Extensions to WebDAV (CalDAV): Time Zones by Reference

Abstract

   This document defines an update to the Calendaring Extensions to    WebDAV (CalDAV) calendar access protocol (RFC 4791) to allow clients    and servers to exchange iCalendar data without the need to send full    time zone data.

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/rfc7809.

Copyright Notice

   Copyright (c) 2016 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                        Standards Track                    [Page 1]
 RFC 7809               CalDAV Time Zone Extension             March 2016

 Table of Contents

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

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

   3.  Time Zones by Reference . . . . . . . . . . . . . . . . . . .   3

     3.1.  New Server Behavior . . . . . . . . . . . . . . . . . . .   4

   4.  New Client Behavior . . . . . . . . . . . . . . . . . . . . .   7

   5.  New WebDAV Properties . . . . . . . . . . . . . . . . . . . .   8

     5.1.  CALDAV:timezone-service-set . . . . . . . . . . . . . . .   8

     5.2.  CALDAV:calendar-timezone-id . . . . . . . . . . . . . . .   9

   6.  XML Element Definitions . . . . . . . . . . . . . . . . . . .   9

     6.1.  CALD...