Get JS of the previous day (timestamp conversion)

  <script type="text/javascript">
		//  Get the current timestamp 
    	var timestamp = (new Date()).getTime();
		//  Timestamp of the time of day 
		var onday = 1000*60*60*24
		//  The time stamp of a day's time money 
		var  beforeTime = timestamp - onday
       
		function getTime(times){
    
		var time = new Date(times);
		var y = time.getFullYear();
		var m = time.getMonth()+1 ;
		var d = time.getDate();
		 m = m>=0 && m<=9 ? '0'+m : m
		 d = d>=0 && d<=9 ? '0'+d : d
		return y+'-'+m+'-'+d;
		}
		var t =  getTime(beforeTime)
		console.log(t);
    </script>