Just a time zone hack

timezone.js

let date = new Date();
let offset = 19800;
console.log(parseInt(date.getTime() / 1000));
console.log(date.getTimezoneOffset());
console.log(date.toISOString());
let _offset = 28800 * 1000
console.log(_offset);
date.setTime( date.getTime() - (offset * 1000) + _offset );
console.log(date.toLocaleString('en-US', { hour: 'numeric', minute: 'numeric', hour12: true }),  _offset,date.getTimezoneOffset(), date.getTimezoneOffset() * 60 * 1000);

function changeTimezone(date, ianatz) {
  // suppose the date is 12:00 UTC
  var invdate = new Date(
    date.toLocaleString("en-US", {
      timeZone: ianatz,
    })
  );

  // then invdate will be 07:00 in Toronto
  // and the diff is 5 hours
  var diff = date.getTime() - invdate.getTime();
  // so 12:00 in Toronto is 17:00 UTC
  return new Date(date.getTime() - diff); // needs to substract
}
var here = new Date();
var there = changeTimezone(here, "America/Toronto");

console.log(`Here: ${here.toString()}\nToronto: ${there.toLocaleString()}`);