Here you can find the source of addWeeks(w)
Date.prototype.addWeeks = function(w) { this.addDays(w * 7);/*from w ww . j ava2s. c o m*/ };
Date.prototype.addWeeks = function(value) { this.addDays(value * 7); return this; };
Date.prototype.addWeeks = function(w) { this.addDays(w * 7); }; Date.prototype.addDays = function(d) { this.setDate(this.getDate() + d); };