def standard
std = Icalendar::Standard.new
if dst?
std.timezone_name = abbreviation.to_s.sub("DT","ST")
std.timezone_offset_from = end_transition.offset_from
std.timezone_offset_to = end_transition.offset_to
std.dtstart = end_transition.dtstart
std.recurrence_rules = end_transition.rrule
else
std.timezone_name = abbreviation.to_s
std.timezone_offset_from = start_transition.offset_from
std.timezone_offset_to = start_transition.offset_to
std.dtstart = start_transition.dtstart
std.recurrence_rules = start_transition.rrule
end
return std
end