rms the following steps:
      </p>
      <emu-alg>
        1. Let _plainDate_ be the *this* value.
        1. Perform ? RequireInternalSlot(_plainDate_, [[InitializedTemporalDate]]).
        1. Return CalendarISOToDate(_plainDate_.[[Calendar]], _plainDate_.[[ISODate]]).[[MonthCode]].
      </emu-alg>
    </emu-clause>

    <emu-clause id="sec-get-temporal.plaindate.prototype.day">
      <h1>get Temporal.PlainDate.prototype.day</h1>
      <p>
        `Temporal.PlainDate.prototype.day` is an accessor propert