native-timezone.js

(() => {
function getLocale() {
  // IE 11 does not support navigator.languages
  return navigator.languages ? navigator.languages[0] : navigator.language;
}
function isTimezoneSupported(timezone) {
  try {
    new Date().toLocaleDateString(getLocale(), { timeZone: timezone });
  } catch (err) {
    if (err instanceof RangeError) {
      return false;
    }
    throw err;
  }
  return true;
}
function formatDateWithTimezone(date, timezone) {
  if (!isTimezoneSupported(timezone)) {
    return '';
  }
  const formattedDate = date.toLocaleDateString(getLocale(), { timeZone: timezone });
  const formattedTime = date.toLocaleTimeString(getLocale(), { timeZone: timezone });
  return formattedDate + ' ' + formattedTime + ' ' + timezone;
}
console.log({
  utc: formatDateWithTimezone(new Date(), 'UTC'),
  'America/New_York': formatDateWithTimezone(new Date(), 'America/New_York'),
  'Asia/Kolkata': formatDateWithTimezone(new Date(), 'Asia/Kolkata'),
}) 
})()