Date.prototype.dateAdd = function(p_Interval, p_Number){
    
    if(isNaN(p_Number)){
    
        //Only accpets numbers 
        //throws an error so that the coder can see why he effed up    
        throw "The second parameter must be a number. \n You passed: " + p_Number;
        return false;
    }

    p_Number = new Number(p_Number);
    switch(p_Interval.toLowerCase()){
        case "yyyy": {// year
            this.setFullYear(this.getFullYear() + p_Number);
            break;
        }
        case "q": {        // quarter
            this.setMonth(this.getMonth() + (p_Number*3));
            break;
        }
        case "m": {        // month
            this.setMonth(this.getMonth() + p_Number);
            break;
        }
        case "y":        // day of year
        case "d":        // day
        case "w": {        // weekday
            this.setDate(this.getDate() + p_Number);
            break;
        }
        case "ww": {    // week of year
            this.setDate(this.getDate() + (p_Number*7));
            break;
        }
        case "h": {        // hour
            this.setHours(this.getHours() + p_Number);
            break;
        }
        case "n": {        // minute
            this.setMinutes(this.getMinutes() + p_Number);
            break;
        }
        case "s": {        // second
            this.setSeconds(this.getSeconds() + p_Number);
            break;
        }
        case "ms": {        // second
            this.setMilliseconds(this.getMilliseconds() + p_Number);
            break;
        }
        default: {
        
            //throws an error so that the coder can see why he effed up and
            //a list of elegible letters.
            throw    "The first parameter must be a string from this list: \n" +
                    "yyyy, q, m, y, d, w, ww, h, n, s, or ms. You passed: " + p_Interval;
            return false;
        }
    }
    return this;
}

Date.prototype.stripTime = function(){
	this.setHours(0);
	this.setSeconds(0);
	this.setMinutes(0);
	this.setMilliseconds(0);
	return this;
}

function daysDifferent(fD,sD){
	var firstDate = new Date(fD);
	var secondDate = new Date(sD);
	
	var dd = 0;
	
	while(firstDate.getYear()!= secondDate.getYear()){
		var years = secondDate.getYear() - firstDate.getYear();
		var daysAdd = years * 350;
		firstDate.dateAdd("d",daysAdd);
		dd+= daysAdd;
	}
	
	while(firstDate.getMonth()!= secondDate.getMonth()){
		var months = secondDate.getMonth() - firstDate.getMonth();
		var daysAdd = months * 25;
		firstDate.dateAdd("d",daysAdd);
		dd+= daysAdd;
	}
	
	while(firstDate.getDate()!= secondDate.getDate()){
		var daysAdd = secondDate.getDate() - firstDate.getDate();
		firstDate.dateAdd("d",daysAdd);
		dd+= daysAdd;
	}
	
	return dd;
}