Date.prototype.getUTCDate()

const date1 = new Date("August 19, 1975 23:15:30 GMT+11:00");
const date2 = new Date("August 19, 1975 23:15:30 GMT-11:00");

console.log(date1.getUTCDate());
// Expected output: 19

console.log(date2.getUTCDate());
// Expected output: 20

getUTCDate()

const today = new Date();
const dayOfMonth = today.getUTCDate();