gistfile1.js

Date.prototype.getAMPMHour = function() { hour=Date.padded2(this.getHours()); return (hour == null) ? 00 : (hour > 24 ? hour - 24 : hour ) }
Date.prototype.getAMPM = function() { return (this.getHours() < 12) ? "" : ""; }

Date.prototype.toFormattedString = function(include_time){
  str = this.getFullYear() + '/' + Date.padded2(this.getMonth() + 1) + '/' +Date.padded2(this.getDate());

  if (include_time) { hour=this.getHours(); str += " " + this.getAMPMHour() + ":" + this.getPaddedMinutes() }
  return str;
}

Date.parseFormattedString = function (string) {
  var regexp = "([0-9]{4}\/[0-1]?[0-9]\/[0-3]?[0-9]) ([0-9]{2}:[0-9]{2})";

  var d = string.match(new RegExp(regexp, "i"));
  if (d==null) {
    return Date.parse(string); // Give javascript a chance to parse it.
  }

  ymd = d[1].split('/');
  hrs = 0;
  mts = 0;
  if(d[2] != null) {
    hrs = parseInt(d[2].split(':')[0], 10);
    mts = parseInt(d[2].split(':')[1], 10);
  }
  return new Date(ymd[0], parseInt(ymd[1], 10)-1, ymd[2], hrs, mts, 0);
}