class TZInfo::DataTimezone

def canonical_zone
  self
end

def period_for(time)
  raise ArgumentError, 'time must be specified' unless time
  timestamp = Timestamp.for(time)
  raise ArgumentError, 'time must have a specified utc_offset' unless timestamp.utc_offset
  info.period_for(timestamp)
end

def periods_for_local(local_time)
  raise ArgumentError, 'local_time must be specified' unless local_time
  info.periods_for_local(Timestamp.for(local_time, :ignore))
end

def transitions_up_to(to, from = nil)
  raise ArgumentError, 'to must be specified' unless to
  to_timestamp = Timestamp.for(to)
  from_timestamp = from && Timestamp.for(from)
  begin
    info.transitions_up_to(to_timestamp, from_timestamp)
  rescue ArgumentError => e
    raise ArgumentError, e.message.gsub('_timestamp', '')
  end
end