Date Prettier

gistfile1.js

var DATE_PRETTIFIER = {
  date: null,
  parse: function(input) {
    if(input.length >= 8) {
        var day, month, year;
        day = parseInt(input.substring(6,8), 10);
        month = parseInt(input.substring(4,6), 10);
        year = parseInt(input.substring(0,4), 10);
        this.date = new Date(year, month, day);
    }
    else
    {
     throw new Error("Invalid Format"); 
    }
  },
  slash: function() {
    return this.date.getDate() + "/" + this.date.getMonth() + "/" + this.date.getFullYear();
  },
  pretty: function() {
      var months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
    return months[this.date.getMonth() - 1] + " " + this.date.getDate() + ", " + this.date.getFullYear();
  }
};
var pretty = Object.create(DATE_PRETTIFIER); //in case of non-ES5-supporting browsers, scrap this line and replace it with var pretty = DATE_PRETTIFIER or something
pretty.parse("20120502");
console.log(pretty.slash()); //gives "2/5/2012"
console.log(pretty.pretty()); //gives "May 2, 2012"