BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Make a Calendar//Week Number//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
UID:mac-week-1980-W4@make-a-calendar.com
DTSTAMP:20260920T181030Z
DTSTART;VALUE=DATE:19800121
DTEND;VALUE=DATE:19800128
SUMMARY:ISO Week 4, 1980
DESCRIPTION:Monday–Sunday · 1980-W04 · Jan 21 – Jan 27, 1980
URL:https://make-a-calendar.com/week-number/1980/4
END:VEVENT
END:VCALENDAR