art day.</p><div class="fullcomment"><div class="comment cmt"><p>The week start day. Must be one of the MO, TU, ... constants specifying the first day of the week.
This will affect recurrences based on weekly periods.
</p></div></div>
    </li><li name="org.saddle.time.RRule#wkst" visbl="pub" data-isabs="false" fullComment="no" group="Ungrouped">
      <a id="wkst:Option[org.saddle.time.Weekday]"></a>
      <a id="wkst:Option[Weekday]"></a>
      <h4 class="signature">
      <span class="modifier_kind">
   