Initialize a Date with Time Zone using JavaScript

main.js

const date = new Date();

// ✅ Get a string according to a provided Time zone
console.log(
  date.toLocaleString('en-US', {
    timeZone: 'America/Los_Angeles',
  }),
); // 👉️ "1/15/2022, 11:54:44 PM"

console.log(
  date.toLocaleString('de-DE', {
    timeZone: 'Europe/Berlin',
  }),
); // 👉️ "16.1.2022, 08:54:44"

// ✅ Or get a Date object with the specified Time zone
function changeTimeZone(date, timeZone) {
  if (typeof date === 'string') {
    return new Date(
      new Date(date).toLocaleString('en-US', {
        timeZone,
      }),
    );
  }

  return new Date(
    date.toLocaleString('en-US', {
      timeZone,
    }),
  );
}

const laDate = changeTimeZone(new Date(), 'America/Los_Angeles');
console.log(laDate); // 👉️ "Sun Jan 15 2022 11:54:44"

const berlinDate = changeTimeZone(new Date(), 'Europe/Berlin');
console.log(berlinDate); // 👉️ "Sun Jan 16 2022 08:54:44"