Javascript: How to generate monthly dates?

Question

I need to calculate monthly dates, that is, given a particular date, generate dates for the next 2 years for example. I came up with the following code:

var d = new Date( '2007-12-31' );
  d.setMonth( d.getMonth() + 1 );
  for (var i = 1; i<24; i++){
    var newdate = d.getDate() + "-" + d.getMonth()+i + '-' + d.getFullYear()
    print(newdate);
  }

However, this is producing:

(...)
31-06-2008  (ok)
31-07-2008  (ok)
31-08-2008  (ok)
31-09-2008  (ok)
31-010-2008 (error, 3 characters for month) 
31-011-2008 (error, 3 characters for month)
31-012-2008 (error, 3 characters for month)
31-013-2008 (error, should be 31-01-2009)
31-014-2008 (error, should be 28-02-2009)

Please, is there any way of producing monthly dates considering some months are 30 or 31 days and February is 28 or 29 depending on the years? Thanks!

Answer 1

Try the following:

var d = new Date(2007, 11, 31);
d.setDate(d.getDate()+1);
for(i=1; i<24; i++) { 
    d.setMonth(d.getMonth()+1);
    d.setDate(1);
    d.setDate(d.getDate()-1);
    document.write(d.getDate() + "-" + ("0" + (d.getMonth()+1)).slice(-2) + '-' + d.getFullYear() + '<br />');
    d.setDate(d.getDate()+1);
    }

1. Step forward one month
2. Set the date to first of the month
3. Step back one day (last day of previous month)
4. Write the date (prepend 0 and use slice() to get the last two characters)
5. Step forward one day to return to next month
6. Increment the month