JS date and string conversion to each other!!

Convert a date to a string

 　　　　　　　　　　dateToString: function(date){  
			var year = date.getFullYear();  
			var month =(date.getMonth() + 1).toString();  
			var day = (date.getDate()).toString();   
			if (month.length == 1) {  
				month = "0" + month;  
			}  
			if (day.length == 1) {  
				day = "0" + day;  
			}
			var dateTime = year + "-" + month + "-" + day;
			return dateTime;  
		  },

Convert two strings to date

		stringToDate : function(dateStr,separator){
			 if(!separator){
					separator="-";
			 }
		     var dateArr = dateStr.split (separator);
		     var year = parseInt (dateArr [0]);
		     var month;
		     // handle the case where the month is 04                          
		     if(dateArr[1].indexOf("0") == 0){
		         month = parseInt(dateArr[1].substring(1));
		     }else{
		          month = parseInt(dateArr[1]);
		     }
		     var day = parseInt (dateArr [2]);
		     var date = new Date(year,month -1,day);
		     return date;
		 },