nge for Temporal.
        </dd>
      </dl>
      <emu-alg>
        1. If _month_ &lt; 1 or _month_ > 12, then
          1. Return *false*.
        1. Let _daysInMonth_ be ISODaysInMonth(_year_, _month_).
        1. If _day_ &lt; 1 or _day_ > _daysInMonth_, then
          1. Return *false*.
        1. Return *true*.
      </emu-alg>
    </emu-clause>

    <emu-clause id="sec-temporal-balanceisodate" type="abstract operation">
      <h1>
        BalanceISODate (
          _year_: an integer,
          _month