timezone in javascript code example
Example 1: 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)
Example 2: javascript set date to timezone
function convertTZ(date, tzString) {
return new Date((typeof date === "string" ? new Date(date) : date).toLocaleString("en-US", {timeZone: tzString}));
}
// usage: Asia/Jakarta is GMT+7
convertTZ("2012/04/10 10:10:30 +0000", "Asia/Jakarta") // Tue Apr 10 2012 17:10:30 GMT+0700 (Western Indonesia Time)
// Resulting value is regular Date() object
const convertedDate = convertTZ("2012/04/10 10:10:30 +0000", "Asia/Jakarta")
convertedDate.getHours(); // 17
// Bonus: You can also put Date object to first arg
const date = new Date()
convertTZ(date, "Asia/Jakarta") // current date-time in jakarta.
Example 3: 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);