Edit in JSFiddle

var res = [];
var d = new Date(2018, 0, 8, 15, 30);
res[0] = d.toUTCString(); // Mon, 08 Jan 2018 06:30:00 GMT
res[1] = d.toString(); // Mon Jan 08 2018 15:30:00 GMT+0900 (대한민국 표준시)
res[2] = d.toDateString(); // Mon Jan 08 2018
res[3] = d.toTimeString(); // 15:30:00 GMT+0900 (대한민국 표준시)
res[4] = d.toLocaleString(); // 2018. 1. 8. 오후 3:30:00
res[5] = d.toLocaleDateString(); // 2018. 1. 8.
res[6] = d.toLocaleTimeString(); // 오후 3:30:00
res[7] = d.valueOf(); // 1515393000000
res[8] = d.toISOString(); // 2018-01-08T06:30:00.000Z
res[9] = d.toJSON(); // 2018-01-08T06:30:00.000Z

res.forEach(function(item) {
	document.write(item + "<br>");
});