BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Make a Calendar//Week Number//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
UID:mac-week-1981-W20@make-a-calendar.com
DTSTAMP:20260920T170550Z
DTSTART;VALUE=DATE:19810511
DTEND;VALUE=DATE:19810518
SUMMARY:ISO Week 20, 1981
DESCRIPTION:Monday–Sunday · 1981-W20 · May 11 – May 17, 1981
URL:https://make-a-calendar.com/week-number/1981/20
END:VEVENT
END:VCALENDAR