Get Quarter

getQuarter.js

function getQuarter(start, count, direction) {	
  var d = new Date(start);
  var quarter = Math.floor((d.getMonth() / 3));	
  
  switch (direction) {
    case "FORWARD": return new Date(d.getFullYear(), quarter * 3, 1);
    case "BACKWARD": return new Date(d.getFullYear(), quarter * 3 - (3 * count), 1);
  }
  return null;
}

const current = getQuarter(new Date(), 2, 'BACKWARD');

console.log(current.toString())