    </emu-clause>

    <emu-clause id="sec-temporal-isvalidisodate" type="abstract operation">
      <h1>
        IsValidISODate (
          _year_: an integer,
          _month_: an integer,
          _day_: an integer,
        ): a Boolean
      </h1>
      <dl class="header">
        <dt>description</dt>
        <dd>
          The return value is *true* if its arguments form a valid date in the ISO 8601 calendar, and *false* otherwise.
          This includes dates that may fall outside of the allowed ra