BEGIN:VCALENDAR
PRODID:iCalendar-Ruby
VERSION:2.0
X-WR-TIMEZONE:America/Phoenix
BEGIN:VTIMEZONE
TZID:America/Phoenix
X-LIC-LOCATION:America/Phoenix
BEGIN:STANDARD
DTSTART:19671029T020000
RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10
TZNAME:MST
TZOFFSETFROM:-0600
TZOFFSETTO:-0700
END:STANDARD
END:VTIMEZONE
END:VCALENDAR