# Libical RFC calendar standards support

<a id="rfcs"></a>
Libical implements the RFCS:

* [RFC5545][] Internet Calendaring and Scheduling Core Object Specification (iCalendar)
* [RFC5546][] iCalendar Transport-Independent Interoperability Protocol (iTIP)
* [RFC7529][] Non-Gregorian Recurrence Rules in the Internet Calendaring and
  Scheduling Core Object Specification (iCalendar)
* [RFC6350][] vCard Format Specification

as well as iCalendar extensions described in:

* [RFC7986][] New Properties for iCalendar
* [RFC9073][] Event Publishing Extensions to iCalendar
* [RFC9074][] "VALARM" Extensions for iCalendar
* [RFC9253][] Support for iCalendar Relationships

Plus:

* [RFC6047][] iCalendar Message-Based Interoperability Protocol (iMIP)
* [RFC6638][] Scheduling Extensions to CalDAV

[RFC5545]: https://tools.ietf.org/html/rfc5545
[RFC5546]: https://tools.ietf.org/html/rfc5546
[RFC7529]: https://tools.ietf.org/html/rfc7529
[RFC6638]: https://tools.ietf.org/html/rfc6638
[RFC6047]: https://tools.ietf.org/html/rfc6047
[RFC7986]: https://tools.ietf.org/html/rfc7986
[RFC9073]: https://tools.ietf.org/html/rfc9073
[RFC9074]: https://tools.ietf.org/html/rfc9074
[RFC9253]: https://tools.ietf.org/html/rfc9253
[RFC6350]: https://tools.ietf.org/html/rfc6350
