,
          _isoDate2_: an ISO Date Record,
        ): -1, 0, or 1
      </h1>
      <dl class="header">
        <dt>description</dt>
        <dd>
          It performs a comparison of the two dates denoted by _isoDate1_ and _isoDate2_ according to ISO 8601 calendar arithmetic.
        </dd>
      </dl>
      <emu-alg>
        1. If _isoDate1_.[[Year]] > _isoDate2_.[[Year]], return 1.
        1. If _isoDate1_.[[Year]] &lt; _isoDate2_.[[Year]], return -1.
        1. If _isoDate1_.[[Month]] > _isoDate2_.[[Mon