BEGIN:VCALENDAR
BEGIN:VEVENT
DTSTART:20180110
DURATION:P3D
DESCRIPTION:Event with duration (3 days), instead of explicit end.
SUMMARY:Duration Event
END:VEVENT
BEGIN:VEVENT
DTSTART:20180115T100000
DURATION:PT3H
DESCRIPTION:Event with duration (3 hours), instead of explicit end.
SUMMARY:Duration Event
END:VEVENT
BEGIN:VEVENT
DTSTART:20180120T120000
DESCRIPTION:Event without explicit dtend, nor duration property.
SUMMARY:Short event
END:VEVENT
END:VCALENDAR