Date.prototype.getUTCMonth()

const date1 = new Date("December 31, 1975, 23:15:30 GMT+11:00");
const date2 = new Date("December 31, 1975, 23:15:30 GMT-11:00");

// December
console.log(date1.getUTCMonth());
// Expected output: 11

// January
console.log(date2.getUTCMonth());
// Expected output: 0

var today = new Date();
var month = today.getUTCMonth();