BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
BEGIN:VEVENT
DTSTAMP:20230914T090000Z
DTSTART:20230914T090000Z
DTEND:20230914T090000Z
SUMMARY:Bundesweiter Warntag
END:VEVENT
END:VCALENDAR