Get previous date from given date in javascript

We need to substract one day for the given date.  The given date is '24-03-2017'.  By using the below javascript code get previous date.

var date = '24-03-2017';
var nextday = new Date(date.setTime( date.getTime() - 1 * 86400000 ));

var day = nextday.getDate();
var months = (nextday.getMonth() + 1);
// Months use 0 index.		
var nextdate= nextday.getFullYear()+'-'+(months[1] ? month :  '0'+ months[0]) + '-' +  (day[1] ? day :  '0'+ day[0]);	

 

The result is : 

 

 

22-03-2017