Get the lastest 4 quaters in javascript. You could push the result into an array to use it in your script.

last-four-quaters.js

var currentQuater = parseInt(new Date().getMonth() / 3 + 1, 0);
// Quater has to finished
var firstQuater = currentQuater - 1;
// Get current year to know when we get before January.
var firstYear = new Date().getFullYear();

for (var i = 0; i < 4; i++) {
  // If quater is equal to zero, go back a year
  if (firstQuater === 0) {
      firstQuater = 4;
      firstYear--;
  }
  // Get the month
  // First quater starts from januar which is month 0
  var firstMonth = (firstQuater - 1) * 3;
  // Plus 2 month to get the first month
  // Add 1 again to use the trick to get the lastest day
  var lastMonth = (firstQuater - 1) * 3 + 2 + 1;
  // If you put 0 as the day you get the last day in the previous month.
  console.log(firstQuater, firstYear, new Date(firstYear, firstMonth, 1), new Date(firstYear, lastMonth, 0));
  // Count down quater
  firstQuater--;
}