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A standard for group calendaring and scheduling from the IETF. It enables calendaring data to be transmitted and automatically entered into the recipient's schedule. In addition a request for a meeting with free and busy times might be sent, and the recipient's software could book the time automatically and send back the response.

Proposed as a standard to replace proprietary specifications such as in Outlook/Exchange, Lotus Notes and Groupwise, iCalendar messages are files with an .ical, .ics, .ifb or icalendar extension.

The IETF Calendaring and Scheduling Standards Simplification group, dubbed "calsify," works on interoperability between different scheduling systems.

The Successor to vCalendar
iCalendar superseded the vCalendar standard developed by Versit, then turned over to the Internet Mail Consortium (IMC) and later the IETF. It added more detail to vCalendar events and defined a protocol for transporting it.
References in periodicals archive ?
A free web services translates the hCalendar-formatted event listings used by Eventful into the iCalendar standard.
Lotus Organizer 5 incluye FoneSync para transferir contactos a la mayoria de telefonos celulares, administracion de contactos e iCalendar para programar citas por Internet con usuarios que usen distintos sistemas de correo.
Users of the mobile data service can now utilise the iCalendar feature to access and manage their calendars from their mobile phone.
The CommuniGate Pro platform works across multiple calendar standards, such as iCalendar, MAPI, WebCal, and now CalDAV for better interoperability of clients and organisational scheduling services.
The Committee's work is based on the iCalendar (IETF RFC 5545) XML serialization specification (xCal) from The Calendaring and Scheduling Consortium (CalConnect.
Release 6 offers extended Internet functionality such as new HTML publishing features and support for the latest iCalendar, vCalendar and vCard standards.
Interview iCalendar Functionality - This feature allows Peopleclick clients and vendors the ability to automatically create meeting requests in their Microsoft([R]) Outlook([R]) or Lotus([R]) Notes calendar applications upon confirmation of an interview.
In addition, the Bamboo API automatically translates SharePoint-based data into a wide variety of standard formats, such as ATOM, XHTML, JSON, vCard, iCalendar and more.
Calendar is built on the Zimbra platform using the iCalendar (iCal) and CalDAV3 standards.
CalDAV models calendar events as HTTP resources in iCalendar format, and models calendars containing events as WebDAV collections.