convert date to days javascript code example

Example 1: javascript subtract days from date

var myCurrentDate=new Date();
var myPastDate=new Date(myCurrentDate);
    myPastDate.setDate(myPastDate.getDate() - 8);//myPastDate is now 8 days in the past

Example 2: javascript current date add 30 days

var future = new Date();
future.setDate(future.getDate() + 30);