programming-examples/js/Date/Write a JavaScript function to get a two digit representation of a year..js

function sort_year(dt)   
{   
  return ('' + dt.getFullYear()).substr(2);  
}  
  
dt = new Date();   
console.log(sort_year(dt));   
  
dt = new Date(1989, 10, 1);   
console.log(sort_year(dt));