def in_time_range?(time)
      time = Time.parse(time) if ! time.is_a?(Time)
      time_range.cover?(time)
    end
def in_time_range?(time)
      time = Time.parse(time) if ! time.is_a?(Time)
      time_range.cover?(time)
    end
is the supplied time covered by this track?

 @param time [Time]
 @return Boolean