RFC 5545 · PROPOSED STANDARD · 2009

Internet Calendaring and Scheduling Core Object Specification

Overview

RFC 5545, “Internet Calendaring and Scheduling Core Object Specification”, is a Proposed Standard document published in September 2009 by B. Desruisseaux. It obsoletes RFC 2445. It has since been updated by RFC 5546, RFC 6868, RFC 7529, RFC 7953, RFC 7986, RFC 9073, RFC 9074, RFC 9253. The canonical text is published by the RFC Editor.

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. [STANDARDS-TRACK]

Abstract as published in the RFC, via rfc-editor.org.

What “Proposed Standard” means

An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.

Read this RFC

The canonical text of RFC 5545 is hosted at rfc-editor.org. Available in TXT,HTML.

Relationships to other RFCs
This RFC obsoletes
RFC 2445
Other RFCs from 2009

Who Is Online

In total there are 102 users online: 0 registered, 95 guests and 7 bots.

Most users ever online was 5,555 on 17 Jul 2026, 3:23 am.

Bots: AhrefsBot Applebot Baiduspider Bingbot Other Bot PetalBot SemrushBot

Users active in the past 15 minutes. Total registered members: 372