BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Make a Calendar//Week Number//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
UID:mac-week-1981-W4@make-a-calendar.com
DTSTAMP:20260920T170502Z
DTSTART;VALUE=DATE:19810119
DTEND;VALUE=DATE:19810126
SUMMARY:ISO Week 4, 1981
DESCRIPTION:Monday–Sunday · 1981-W04 · Jan 19 – Jan 25, 1981
URL:https://make-a-calendar.com/week-number/1981/4
END:VEVENT
END:VCALENDAR