BEGIN:VCALENDAR
PRODID:-//Test//
VERSION:2.0
BEGIN:VTIMEZONE
TZID:Euro1pe/M123oscow1
BEGIN:STANDARD
TZOFFSETFROM:+0400
TZOFFSETTO:+0400
TZNAME:MSK1
DTSTART:19700101T000000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
UID:d2240999-ab22-410e-97e9-8f562cb87d07
SUMMARY:T07
DESCRIPTION:with unknown-TZID/unknown-VTIMEZONE. without Z/VALUE
DTSTART;TZID=Euro1pe/M123oscow1:20151103T120000
DTEND;TZID=Euro1pe/M123oscow1:20151103T130000
END:VEVENT
END:VCALENDAR