get date range for current month in javascript

I have used Slice function to add leading zero to month,day when formatting date to m-d-y.

$(function(){
var formatted_date = function(date){
				var m = ("0"+ (date.getMonth()+1)).slice(-2); // in javascript month start from 0.
				var d = ("0"+ date.getDate()).slice(-2); // add leading zero 
				var y = date.getFullYear();
				return  m +'-'+d+'-'+y;	
}
         var curr_date =new Date();
	
         var first_day = new Date(curr_date.getFullYear(), curr_date.getMonth(), 1); 

         var last_day = new Date(curr_date.getFullYear(), curr_date.getMonth() + 1, 0);
				
         var month_start_date =formatted_date(first_day);
				
         var month_end_date =formatted_date(last_day);
				
         date=month_start_date + ' To '+month_end_date; // date range for current month

        /*
         var month_end_date =formatted_date(new Date()); // limit current month date range upto current day.
       */


});