BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
BEGIN:VEVENT
UID:czwarty-piatek.zacheta
DTSTAMP:20260728T045044Z
DTSTART:20260728T045044Z
SUMMARY:Czwarty piątek
END:VEVENT
END:VCALENDAR