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

This document defines the iCalendar data format for representing and exchanging calendaring and scheduling information such as events, to-dos, journal…

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Outgoing relationships (20 related RFCs)

Obsoletes, Informative reference — RFC 2445: Internet Calendaring and Scheduling Core Object Specification (iCalendar)
Normative reference — RFC 2119: Key words for use in RFCs to Indicate Requirement Levels
Normative reference — RFC 5234: Augmented BNF for Syntax Specifications: ABNF
Normative reference — RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
Normative reference — RFC 3629: UTF-8, a transformation format of ISO 10646
Normative reference — RFC 2045: Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies
Normative reference — RFC 4648: The Base16, Base32, and Base64 Data Encodings
Normative reference — RFC 2046: Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types
Normative reference — RFC 5646: Tags for Identifying Languages
Normative reference — RFC 4288: Media Type Specifications and Registration Procedures
Normative reference — RFC 2368: The mailto URL scheme
Informative reference — RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1
Informative reference — RFC 2818: HTTP Over TLS
Informative reference — RFC 1738: Uniform Resource Locators (URL)
Informative reference — RFC 2426: vCard MIME Directory Profile
Informative reference — RFC 4791: Calendaring Extensions to WebDAV (CalDAV)
Informative reference — RFC 2392: Content-ID and Message-ID Uniform Resource Locators
Informative reference — RFC 4516: Lightweight Directory Access Protocol (LDAP): Uniform Resource Locator
Informative reference — RFC 2425: A MIME Content-Type for Directory Information
Informative reference — RFC 2397: The "data" URL scheme

Incoming relationships (20 related RFCs)

Updated by — RFC 5546: iCalendar Transport-Independent Interoperability Protocol (iTIP)
Updated by, Normatively referenced by — RFC 7986: New Properties for iCalendar
Updated by, Normatively referenced by — RFC 6868: Parameter Value Encoding in iCalendar and vCard
Updated by — RFC 7529: Non-Gregorian Recurrence Rules in the Internet Calendaring and Scheduling Core Object Specification (iCalendar)
Updated by, Normatively referenced by — RFC 9073: Event Publishing Extensions to iCalendar
Updated by — RFC 7953: Calendar Availability
Updated by, Normatively referenced by — RFC 9074: "VALARM" Extensions for iCalendar
Updated by, Normatively referenced by — RFC 9253: Support for iCalendar Relationships
Normatively referenced by — RFC 6350: vCard Format Specification
Normatively referenced by — RFC 6501: Conference Information Data Model for Centralized Conferencing (XCON)
Normatively referenced by — RFC 6321: xCal: The XML Format for iCalendar
Normatively referenced by — RFC 7808: Time Zone Data Distribution Service
Normatively referenced by — RFC 6638: Scheduling Extensions to CalDAV
Normatively referenced by — RFC 7809: Calendaring Extensions to WebDAV (CalDAV): Time Zones by Reference
Normatively referenced by — RFC 9922: A Common YANG Data Model for Scheduling
Informatively referenced by — RFC 7095: jCard: The JSON Format for vCard
Informatively referenced by — RFC 6648: Deprecating the "X-" Prefix and Similar Constructs in Application Protocols
Informatively referenced by — RFC 6764: Locating Services for Calendaring Extensions to WebDAV (CalDAV) and vCard Extensions to WebDAV (CardDAV)
Informatively referenced by — RFC 9636: The Time Zone Information Format (TZif)
Informatively referenced by — RFC 9671: Sieve Email Filtering: Extension for Processing Calendar Attachments