code: function(year) {
      var date = this.easterSunday(year);
      var y = date.getFullYear();
      var m = date.getMonth() + 1;
      var d = date.getDate() + 1;
      return this.createDate(y, m, d);
    }
docs: Determines the date of Easter Monday.
  Day after Easter Sunday
  @param {number} year
  @return {Date}