JAVASCRIPT

js get timezone name

console.log(Intl.DateTimeFormat().resolvedOptions().timeZone)

javascript set date to timezone

var d = new Date("2020-04-13T00:00:00.000+08:00"); /* midnight in China on April 13th */
d.toLocaleString('en-US', { timeZone: 'America/New_York' });
//=> "4/12/2020, 12:00:00 PM"
// (midnight in China on April 13th is noon in New York on April 12th)

get timezone javascript

const timezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
console.log(timezone);

get current time in different timezone javascript

// current datetime string in America/Chicago timezone
let chicago_datetime_str = new Date().toLocaleString("en-US", { timeZone: "America/Chicago" });

// create new Date object
let date_chicago = new Date(chicago_datetime_str);

javascript get specific timezone

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

}

// E.g.
var here = new Date();
var there = changeTimezone(here, "America/Toronto");

console.log(`Here: ${here.toString()}
Toronto: ${there.toString()}`);
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get timezone name from date javascript

Intl.DateTimeFormat().resolvedOptions().timeZone

timezone offset to timezone in javascript

getGMT() {
    let gmtFigure = new Date().getTimezoneOffset() / -60;
    let gmtSign = gmtFigure >= 0 ? '+' : '-';
    let gmtlength = this.digits_count(gmtFigure);
    let gmt = 'GMT';
    if (gmtlength == 1) {
      gmt += gmtSign + '0' + Math.abs(gmtFigure);
    } else if (gmtlength > 1) {
      gmt += gmtSign + Math.abs(gmtFigure);
    }
    return gmt;
  }


digits_count(n) {
    var count = 0;
    n = Math.abs(n);
    if (n >= 1) ++count;
    while (n / 10 >= 1) {
      n /= 10;
      ++count;
    }
    return count;
  }

how to see my timezone using js

document.getElementById("time").innerHTML = Date().slice(Date().indexOf("(")+1,Date().lastIndexOf(")"));

javascript date timezone

// this example takes 2 seconds to run
const start = Date.now();

console.log('starting timer...');
// expected output: starting timer...

setTimeout(() => {
  const millis = Date.now() - start;

  console.log(`seconds elapsed = ${Math.floor(millis/1000)}`);
  // expected output : seconds elapsed = 2
}, 2000);

timezone using javascript

' check time zone
DateDiff("s", "01/01/1970 00:00:00", Now())