Calendar Availability
RFC 7953
Internet Engineering Task Force (IETF) C. Daboo
Request for Comments: 7953 Apple
Updates: 4791, 5545, 6638 M. Douglass
Category: Standards Track Spherical Cow Group
ISSN: 2070-1721 August 2016
Calendar Availability
Abstract
This document specifies a new iCalendar (RFC 5545) component that
allows the publication of available and unavailable time periods
associated with a calendar user. This component can be used in
standard iCalendar free-busy lookups, including the iCalendar
Transport-independent Interoperability Protocol (iTIP; RFC 5546)
free-busy requests, to generate repeating blocks of available or busy
time with exceptions as needed.
This document also defines extensions to the Calendaring Extensions
to WebDAV (CalDAV) calendar access protocol (RFC 4791) and the
associated scheduling protocol (RFC 6638) to specify how this new
calendar component can be used when evaluating free-busy time.
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 7841.
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/rfc7953.
Daboo & Douglass Standards Track [Page 1]
RFC 7953 Calendar Availability August 2016
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
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions Used in This Document . . . . . . . . . . . . . . 3
3. iCalendar Extensions . . . . . . . . . . . . . . . . . . . . 4
3.1. VAVAILABILITY Component . . . . . . . . . . . . . . . . . 4
3.2. Busy Time Type . . . . . . . . . . . . . . . . . . . . . 10
4. Combining VAVAILABILITY Components . . . . . . . . . . . . . 10
5. Calculating Free-Busy Time . . . . . . . . . . . . . . . . . 12
5.1. Examples . . . . . . . . . . . . . . . . . . . . . . . . 13
6. Use with iTIP . . . . . . . . . . . . . . . . . . . . . . . . 15
7. CalDAV Extensions . . . . . . . . . . . . . . . . . . . . . . 15
7.1. CalDAV Requirements Overview . . . . . . . . . . . . . . 15
7.2. New Features in CalDAV . . . . . . . . . . . . . . . . . 16
8. Security Considerations . . . . . . . . . . . . . . . . . . . 19
9. Privacy Considerations . . . . . . . . . . . . . . . . . . . 19
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 20
10.1. Component Registrations . . . . . . . . . . . . . . . . 20
10.2. Property Registrations . . . . . . . . . . . . . . . . . 20
11. Normative References . . . . . . . . . . . . . . . . . . . . 20
Appendix A. Example Calendar #1 . . . . . . . . . . . . . . . . 22
Appendix B. Example Calendar #2 . . . . . . . . . . . . . . . . 23
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 24
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 24
Daboo & Douglass Standards Track [Page 2]
RFC 7953 Calendar Availability August 2016
1. Introduction
Calendar users often have regular periods of time when they are
either available to be scheduled or always unavailable. For example,
an office worker will often wish only to appear free to their work
colleagues during normal 'office hours' (e.g., Monday through Friday,
9 am through 5 pm). Or, a university professor might only be
available to students during a set period of time (e.g., Thursday
afternoons, 2 pm through 5 pm during term time only). Ideally, users
ought be able to specify such periods directly via their calendar
user agent and have them automatically considered as part of the
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