icalendar

iCalendar File Format

Basics

• Plain text file
• Charset: UTF-8
• Line ending: CRLF (0x0D0A)
• Line length max: 75 octets
• Line continuation: continuation line begin with a space or a tab.

Software

Here is an incomplete list of softwares which support iCalendar format:

• Google Calendar
• Apple iCal
• Evolution
• Lightning for Thunderbird and SeaMonkey

Examples

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//EasyCal Team//NONSGML EasyCal 1.9//EN
BEGIN:VEVENT
UID:uid1@example.com
DTSTAMP:20120307T120000Z
DTSTART:20120314T100000Z
DTEND:20120314T110000Z
SUMMARY:Some event
DESCRIPTION:Meet the big
  and tall guy\nSome Place
END:VEVENT
END:VCALENDAR

NOTE

• Properties that must be specified: UID, DTSTAMP
• Required if no METHOD specified: DTSTART
• UID must be unique. It can be generated by 'timestamp-rand' (?)
• DTSTAMP: the last revised time associated with this iCalendar object if no METHOD specified.

References

• http://tools.ietf.org/html/rfc5545
• http://en.wikipedia.org/wiki/ICalendar#cite_note-From_RFC_2445-10