ics_cli/docs/ics_format.txt

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ICS files from Microsoft Outlook differ from those that were created by Gnome Evolution.
(semicolons are used instead of colons at some position)
Evolution
---------
all line endings are \r\n
all day event:
DTSTART;VALUE=DATE:20230908
DTEND;VALUE=DATE:20230909
an all day event can span over multiple days and look like this:
DTSTART;VALUE=DATE:20230911^M$
DTEND;VALUE=DATE:20230916^M$
The DTEND of an all day event is exclusively, it is not an all day event anymore!
appointment:
DTSTART;TZID=/freeassociation.sourceforge.net/Continent/City:
20230909T090000
DTEND;TZID=/freeassociation.sourceforge.net/Continent/City:
20230909T093000
appointments can also span over multiple days:
DTSTART;TZID=/freeassociation.sourceforge.net/Europe/Berlin:
20230913T230000
DTEND;TZID=/freeassociation.sourceforge.net/Europe/Berlin:
20230914T040000
SEQUENCE is the number of times the event was modified.
Evolution sets this to 2 after it has been generated.
Appointments include the continent and city of the used time zone.
"DESCRIPTION:" is an optional field.