How to use moment-tz.js to parse tz like “GMT-08:00”

Question

I try to run this js

return function(milliSeconds, timeZoneId) {
    if (milliSeconds == 0) {
        return \"\";
    }
    var now = moment();

    return now.         


        

Answer 1

As moment.tz(..., String) docs states:

The moment.tz constructor takes all the same arguments as the moment constructor, but uses the last argument as a time zone identifier.

A time zone identifier is something like 'America/New_York' or 'Europe/Rome', "GMT-08:00" is not a valid input.

In your case you can use moment(Number) and then:

• converting to given zone using tz() function
• or set offset using utcOffset(String)

var milliSeconds = "1524578400000";
var timezoneId = "GMT-08:00";

var timeInt = parseInt(milliSeconds, 10)
var m1 = moment(timeInt).tz('America/Los_Angeles');
console.log(m1.format('MMM D, YYYY H:mm:ss'));

var offset = timezoneId.substring(3);
var m2 = moment(timeInt).utcOffset(offset);
console.log(m2.format('MMM D, YYYY H:mm:ss'));

Please note that:

• moment formatting tokens are case sensitive, so you have to use YYYY for years and D for day of the month (d is day of the week)
• 1524578400000 is 2018-04-24 14:00:00 UTC, I'm missing why you are expecting 5am as output.