code: function(d) {
      return d.wm || (d.wm =
        (later.D.val(d) +
        (later.dw.val(later.M.start(d)) - 1) + (7 - later.dw.val(d))) / 7);
    }
docs: The week of month value of the specified date.
  
  @param {Date} d: The date to calculate the value of