BEGIN:VCALENDAR
PRODID:-//Emacs//NONSGML icalendar.el//EN
VERSION:2.0
BEGIN:VEVENT
DTSTART:20181105T200000Z
DTSTAMP:20181105T181652Z
DESCRIPTION:
LAST-MODIFIED:20181105T181646Z
LOCATION:
SEQUENCE:0
SUMMARY:event with same start/end time
TRANSP:OPAQUE
END:VEVENT
END:VCALENDAR