Get legal drinking age of user

legal-drinking-age.js

/*
  Legal Drinking Age
  
  Created by Nathan Searles <http://nathansearles.com>

  Version: 1.0
  Updated: July 23rd, 2012

  (c) 2012 by Nathan Searles

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

/*
  Example usage:
  isLegalDrinkingAge.dateOfBirth('07/23/91');
*/

isLegalDrinkingAge = {
  option: {
    'age': 21
  },
  dateOfBirth: function( date ) {
    if (this.legalAgeToday() <= this.calculateDays( date )) {
      return true;
    } else {
      return false;
    }
  },
  legalAgeToday: function() {
    var date = new Date();
    var month = date.getMonth() + 1;
    var day = date.getDate();
    var year = date.getFullYear() - this.option.age;

    return this.calculateDays( month + "/" + day + "/" + year );
  },
  dateToday: function() {
    var date = new Date();
    var month = date.getMonth() + 1;
    var day = date.getDate();
    var year = date.getFullYear();

    return month + "/" + day + "/" + year;
  },
  calculateDays: function( date ) {
    var difference = Date.parse( this.dateToday() ) - Date.parse( date ); 
    var totalDays = Math.floor( difference / 86400000 );

    return totalDays;
  }
};

I want to know if there is a program I could use. Is this a web app?