def make year, month, day
      first_time = DateTime.civil year, month, day, first.hour, first.minute
      last_time  = DateTime.civil year, month, day, last.hour,  last.minute
      (first_time..last_time)
    end
def make year, month, day
      first_time = DateTime.civil year, month, day, first.hour, first.minute
      last_time  = DateTime.civil year, month, day, last.hour,  last.minute
      (first_time..last_time)
    end
:nodoc: