Get time of specific timezone [duplicate]

If you know the UTC offset then you can pass it and get the time using the following function:

function calcTime(city, offset) {
    // create Date object for current location
    var d = new Date();

    // convert to msec
    // subtract local time zone offset
    // get UTC time in msec
    var utc = d.getTime() + (d.getTimezoneOffset() * 60000);

    // create new Date object for different city
    // using supplied offset
    var nd = new Date(utc + (3600000*offset));

    // return time as a string
    return "The local time for city"+ city +" is "+ nd.toLocaleString();

alert(calcTime('Bombay', '+5.5'));

Taken from: Convert Local Time to Another

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