Javascript Date Extensions

date.js

  Date.prototype.formatMMDDYYY = function() {
    return this.getMonth() + 1 + '/' + this.getDate() + '/' + this.getFullYear();
  };

  Date.prototype.formatMMDD = function() {
    return this.getMonth() + 1 + '/' + this.getDate();
  };

  Date.prototype.addDays = function(days) {
    days = this.getDate() + days;
    return this.setDate(days);
  };