Date.DAYNAMES = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];

Date.prototype.getFullDay = function(){
    return Date.DAYNAMES[this.getDay()];
};

Date.prototype.getSensiblyIndexedMonth = function(){
    return this.getMonth() + 1;
}

Date.prototype.getTwoDigitSensiblyIndexedMonth = function(){
    return (this.getSensiblyIndexedMonth() > 9) ? this.getSensiblyIndexedMonth() :
    	'0' + this.getSensiblyIndexedMonth();
}

Date.prototype.getTwoDigitDate = function()
{
	return (this.getDate() > 9) ? this.getDate() : '0' + this.getDate();
}

Date.prototype.getSensiblyIndexedAsString = function(){
    dy = this.getFullYear();
    dm = this.getMonth() + 1;
    dd = this.getDate();
    return dy + '-' + dm + '-' + dd;
}

Date.newFromString = function(theString){
	
    ad = theString.split("-");
    y = parseInt(ad[0],10);
    m = parseInt(ad[1],10) - 1;
    d = parseInt(ad[2],10);
    od = new Date(y, m, d);
    return od;
}

Date.prototype.getPrettyString = function(){
    return this.getTwoDigitSensiblyIndexedMonth() + ' / ' + 
			this.getTwoDigitDate() + ' / ' + 
			this.getFullYear()
}

Date.prototype.incrementDay = function(amount){
    tm = this.getTime(); //milliseconds, 0=January 1, 1970
    day = this.getDate();
    dayInMillis = 3600 * 24 * 1000; //1 day in milisec 
    tm = tm + (dayInMillis * amount);
    this.setTime(tm);
	// daylight savings fix, sometimes a day is 23 or 25 hours
	if (this.getDate() == day) this.setTime(this.getTime() + ((3600 * 1000) * amount)) 
}

Date.prototype.isAcceptableForSchedule = function()
{
	today = new Date();
	return (
  			(this.getYear() != today.getYear()) &&
			(
				(this.getYear() == today.getYear()+1 && this.getMonth() == 0) ||
				(this.getYear() == today.getYear()-1 && this.getMonth() == 11)
			) ||
			(this.getMonth() >= today.getMonth() -1 && this.getMonth() <= today.getMonth() + 1)
		);
}

// Simulates PHP's date function
Date.prototype.format = function(format){
    var returnStr = '';
    var replace = Date.replaceChars;
    for (var i = 0; i < format.length; i++) {
        var curChar = format.charAt(i);
        if (replace[curChar]) 
            returnStr += replace[curChar].call(this);
        else 
            returnStr += curChar;
    }
    return returnStr;
};
Date.replaceChars = {
    shortMonths: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
    longMonths: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
    shortDays: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
    longDays: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
    
    // Day
    d: function(){
        return (this.getDate() < 10 ? '0' : '') + this.getDate();
    },
    D: function(){
        return Date.replace.shortDays[this.getDay()];
    },
    j: function(){
        return this.getDate();
    },
    l: function(){
        return Date.replace.longDays[this.getDay()];
    },
    N: function(){
        return this.getDay() + 1;
    },
    S: function(){
        return (this.getDate() % 10 == 1 && this.getDate() != 11 ? 'st' : (this.getDate() % 10 == 2 && this.getDate() != 12 ? 'nd' : (this.getDate() % 10 == 3 && this.getDate() != 13 ? 'rd' : 'th')));
    },
    w: function(){
        return this.getDay();
    },
    z: function(){
        return "Not Yet Supported";
    },
    // Week
    W: function(){
        return "Not Yet Supported";
    },
    // Month
    F: function(){
        return Date.replace.longMonths[this.getMonth()];
    },
    m: function(){
        return (this.getMonth() < 11 ? '0' : '') + (this.getMonth() + 1);
    },
    M: function(){
        return Date.replace.shortMonths[this.getMonth()];
    },
    n: function(){
        return this.getMonth() + 1;
    },
    t: function(){
        return "Not Yet Supported";
    },
    // Year
    L: function(){
        return "Not Yet Supported";
    },
    o: function(){
        return "Not Supported";
    },
    Y: function(){
        return this.getFullYear();
    },
    y: function(){
        return ('' + this.getFullYear()).substr(2);
    },
    // Time
    a: function(){
        return this.getHours() < 12 ? 'am' : 'pm';
    },
    A: function(){
        return this.getHours() < 12 ? 'AM' : 'PM';
    },
    B: function(){
        return "Not Yet Supported";
    },
    g: function(){
        return this.getHours() == 0 ? 12 : (this.getHours() > 12 ? this.getHours() - 12 : this.getHours());
    },
    G: function(){
        return this.getHours();
    },
    h: function(){
        return (this.getHours() < 10 || (12 < this.getHours() < 22) ? '0' : '') + (this.getHours() < 10 ? this.getHours() + 1 : this.getHours() - 12);
    },
    H: function(){
        return (this.getHours() < 10 ? '0' : '') + this.getHours();
    },
    i: function(){
        return (this.getMinutes() < 10 ? '0' : '') + this.getMinutes();
    },
    s: function(){
        return (this.getSeconds() < 10 ? '0' : '') + this.getSeconds();
    },
    // Timezone
    e: function(){
        return "Not Yet Supported";
    },
    I: function(){
        return "Not Supported";
    },
    O: function(){
        return (this.getTimezoneOffset() < 0 ? '-' : '+') + (this.getTimezoneOffset() / 60 < 10 ? '0' : '') + (this.getTimezoneOffset() / 60) + '00';
    },
    T: function(){
        return "Not Yet Supported";
    },
    Z: function(){
        return this.getTimezoneOffset() * 60;
    },
    // Full Date/Time
    c: function(){
        return "Not Yet Supported";
    },
    r: function(){
        return this.toString();
    },
    U: function(){
        return this.getTime() / 1000;
    }
}