code: function(d) {
      return d.dcStart || (d.dcStart =
        later.date.next(
          later.Y.val(d),
          later.M.val(d),
          Math.max(1, ((later.dc.val(d) - 1) * 7) + 1 || 1)));
    }
docs: The first day of the month with the same day of week count as the date
  specified.
  
  @param {Date} d: The specified date