function day_of_the_month(d)  
{   
  return (d.getDate() < 10 ? '0' : '') + d.getDate();  
}  
  
d= new Date();  
console.log(day_of_the_month(d));  
  
d= new Date(2015, 10, 1);  
console.log(day_of_the_month(d));