function quarter_of_the_year(date)   
  {  
    var month = date.getMonth() + 1;  
    return (Math.ceil(month / 3));  
  }  
  
  
console.log(quarter_of_the_year(new Date()));  
console.log(quarter_of_the_year(new Date(2015, 1, 21)));   
console.log(quarter_of_the_year(new Date(2015, 10, 18)));  