src/constraint/weekofmonth.js
function(d) {
    return d.wmExtent || (d.wmExtent = [1,
      (later.D.extent(d)[1] + (later.dw.val(later.M.start(d)) - 1) +
      (7 - later.dw.val(later.M.end(d)))) / 7]);
  }
function(d) {
    return d.wmExtent || (d.wmExtent = [1,
      (later.D.extent(d)[1] + (later.dw.val(later.M.start(d)) - 1) +
      (7 - later.dw.val(later.M.end(d)))) / 7]);
  }
function ( d ) { return d . wmExtent || ( d . wmExtent = [ 1 , ( later . D . extent ( d ) [ 1 ] + ( later . dw . val ( later . M . start ( d ) ) - 1 ) + ( 7 - later . dw . val ( later . M . end ( d ) ) ) ) / 7 ] ) ; }
The minimum and maximum valid week of month values for the month indicated.
Zero indicates the last week in the month.

@param {Date} d: The date indicating the month to find values for
The minimum and maximum valid week of month values for the month indicated . Zero indicates the last week in the month .