Javascript Timezone

index.js

// get local timezone offset and convert to millisecond
var d = new Date();
var offset = d.getTimezoneOffset();
const localOffsetMillis = 60 * 1000 * offset;
console.log(localOffsetMillis);

// get local timezone name
var dtf = Intl.DateTimeFormat();
var dtfResolveOptions = dtf.resolvedOptions();
var tz = dtfResolveOptions.timeZone;
console.log(tz);


var nowOnUTC = new Date();
console.log(nowOnUTC);

// convert UTC date to local date by adding with localOffsetMillis
var localDate = new Date((nowOnUTC.getTime() + Math.abs(localOffsetMillis)));
console.log(localDate);

var localDateWTZ = nowOnUTC.toLocaleString('ID', {timeZone: tz});
console.log(localDateWTZ);