BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//samplelib.com//Sample ICS//EN
CALSCALE:GREGORIAN
BEGIN:VEVENT
UID:alarm-0001@samplelib.com
DTSTAMP:20260101T090000Z
DTSTART:20260310T080000Z
DTEND:20260310T090000Z
SUMMARY:Dentist appointment
BEGIN:VALARM
TRIGGER:-PT30M
ACTION:DISPLAY
DESCRIPTION:Reminder: dentist in 30 minutes
END:VALARM
END:VEVENT
END:VCALENDAR