BEGIN:VCALENDAR
NAME:Date Based Calendar
PRODID:-//CalMerge//Calendar Merger 1.0//EN
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VEVENT
UID:20231225T000000-001@example.com
DTSTART;VALUE=DATE:20231225
DTEND;VALUE=DATE:20231226
DTSTAMP:20231225T000000Z
SUMMARY:holiday_calendar_2023 Christmas Day
LOCATION:Germany
END:VEVENT
BEGIN:VEVENT
UID:20231225T000000-001@example.com
DTSTART;VALUE=DATE:20231225
DTEND;VALUE=DATE:20231226
DTSTAMP:20231225T000000Z
SUMMARY:US_holidays Christmas Day
END:VEVENT
END:VCALENDAR