JSFiddle - React, Tailwind, and code Playground

JavaScript

const yourTime = new Date();

console.log('your date is: ' + yourTime);
const minutesFromUTC = yourTime.getTimezoneOffset();

const utcTime = new Date(yourTime.setMinutes(yourTime.getMinutes()+minutesFromUTC));
console.log('utc date is: ' + utcTime);

const tokyoFromUTC = 9*60; // Tokya is 9 hours

const tokyoTime = new Date(utcTime.setMinutes(utcTime.getMinutes()+tokyoFromUTC));
console.log('tokyo date is: ' + tokyoTime);