convert number to month javascript code example

Example 1: how to get the number of days in a month in javascript

// instantiate a date object
 var dt = new Date();

// dt.getMonth() will return a month between 0 - 11
// we add one to get to the last day of the month 
// so that when getDate() is called it will return the last day of the month
 var month = dt.getMonth() + 1;
 var year = dt.getFullYear();

// this line does the magic (in collab with the lines above)
 var daysInMonth = new Date(year, month, 0).getDate();

Example 2: javascript add days to date

var myCurrentDate=new Date();
var myFutureDate=new Date(myCurrentDate);
    myFutureDate.setDate(myFutureDate.getDate()+ 8);//myFutureDate is now 8 days in the future