BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//time.you/holidays//NONSGML v1.0//EN
BEGIN:VEVENT
UID:15061a32-a1ba-4093-a83b-bb2df4cf2d16
DTSTAMP:20260506T055955Z
DTSTART;VALUE=DATE:20211231
SUMMARY:Day off (substituted from 01/03/2021) (Russia)
END:VEVENT
END:VCALENDAR