function calcTime(city, offset) {

​

    d = new Date();

​

    utc = d.getTime() + (d.getTimezoneOffset() * 60000);

​

    nd = new Date(utc + (3600000*offset));

​

    return "The local time in " + city + " is " + nd.toLocaleString();

​

}

​

// get Bombay time

console.log(calcTime('Bombay', '+5.5'));

​

// get Singapore time

console.log(calcTime('Singapore', '+8'));

​

// get London time

console.log(calcTime('London', '+1'));

var timedifference = new Date().getTimezoneOffset();

​

function getTimeFromTimezone(offset) {  

  const currentDate = new Date() //get current time to calculate the UTC time

  let utc = currentDate.getTime() + (currentDate.getTimezoneOffset() * 60000) //calculates the UTC time

  let nd = new Date(utc + (3600000*offset)) // get the current timezone with the offset

  return nd

}

​

getTimeFromTimezone('+5.5').toLocaleString()

getTimeFromTimezone('-3').toLocaleString()

if (!sessionStorage.getItem('timezone')) {

  var tz = jstz.determine() || 'UTC';

  sessionStorage.setItem('timezone', tz.name());

}

var currTz = sessionStorage.getItem('timezone');

var timedifference = new Date().getTimezoneOffset();

//This returns the difference from the clients timezone from UTC time. You can then play around with it as you like.

​