Internet Calendaring and Scheduling Core Object Specification (iCalendar)
RFC 5545

Network Working Group                               B. Desruisseaux, Ed.
Request for Comments: 5545                                        Oracle
Obsoletes: 2445                                           September 2009
Category: Standards Track

     Internet Calendaring and Scheduling Core Object Specification
                              (iCalendar)

Abstract

This document defines the iCalendar data format for representing and
exchanging calendaring and scheduling information such as events,
to-dos, journal entries, and free/busy information, independent of any
particular calendar service or protocol.

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

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Desruisseaux                Standards Track                     [Page 1]
RFC 5545                       iCalendar                  September 2009

   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  Basic Grammar and Conventions . . . . . . . . . . . . . . . .   6
     2.1.  Formatting Conventions  . . . . . . . . . . . . . . . . .   6
     2.2.  Related Memos . . . . . . . . . . . . . . . . . . . . . .   7
   3.  iCalendar Object Specification  . . . . . . . . . . . . . . .   8
     3.1.  Content Lines . . . . . . . . . . . . . . . . . . . . . .   8
       3.1.1.  List and Field Separators . . . . . . . . . . . . . .  11
       3.1.2.  Multiple Values . . . . . . . . . . . . . . . . . . .  11
       3.1.3.  Binary Content  . . . . . . . . . . . . . . . . . . .  11
       3.1.4.  Character Set . . . . . . . . . . . . . . . . . . . .  12
     3.2.  Property Parameters . . . . . . . . . . . . . . . . . . .  12
       3.2.1.  Alternate Text Representation . . . . . . . . . . . .  13
       3.2.2.  Common Name . . . . . . . . . . . . . . . . . . . . .  15
       3.2.3.  Calendar User Type  . . . . . . . . . . . . . . . . .  15
       3.2.4.  Delegators  . . . . . . . . . . . . . . . . . . . . .  16
       3.2.5.  Delegatees  . . . . . . . . . . . . . . . . . . . . .  16
       3.2.6.  Directory Entry Reference . . . . . . . . . . . . . .  17
       3.2.7.  Inline Encoding . . . . . . . . . . . . . . . . . . .  17
       3.2.8.  Format Type . . . . . . . . . . . . . . . . . . . . .  18
       3.2.9.  Free/Busy Time Type . . . . . . . . . . . . . . . . .  19
       3.2.10. Language  . . . . . . . . . . . . . . . . . . . . . .  20
       3.2.11. Group or List Membership  . . . . . . . . . . . . . .  20
       3.2.12. Participation Status  . . . . . . . . . . . . . . . .  21
       3.2.13. Recurrence Identifier Range . . . . . . . . . . . . .  22
       3.2.14. Alarm Trigger Relationship  . . . . . . . . . . . . .  23
       3.2.15. Relationship Type . . . . . . . . . . . . . . . . . .  24
       3.2.16. Participation Role  . . . . . . . . . . . . . . . . .  25
       3.2.17. RSVP Expectation  . . . . . . . . . . . . . . . . . .  25
       3.2.18. Sent By . . . . . . . . . . . . . . . . . . . . . . .  26
       3.2.19. Time Zone Identifier  . . . . . . . . . . . . . . . .  26
       3.2.20. Value Data Types  . . . . . . . . . . . . . . . . . .  28
     3.3.  Property Value Data Types . . . . . . . . . . . . . . . .  29