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I have a string, 'Jan 24, 2019 12:00 PST', where the time is set to the browser's timezone. How would I use moment to convert this into another timezone (ie - America/New_York), and then get the time in that timezone?

So in my example above, I have the string 'Jan 24, 2019 12:00 PST' where the timezone is in the browser's timezone (Seattle). I am trying to get 'Jan 24, 2019 15:00' when converting it into New York timezone.

Jon
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2 Answers2

5

How about just:

var s = "Jan 24, 2019 12:00 PST";
var d = new Date(s);
var m = moment(d).tz("America/New_York");
console.log(m.format("MMM DD Y, hh:mm z"));

The only worry here is where you got that string. That particular string works in every browser, as far as I know. But the Date constructor doesn't seem to support named offsets like "PST" outside the US, so if you got like CEST for central European time, that won't quite work. In that case, just chop off the PST and parse it with Moment's string parsing functions. Since you already know the string was generated in the same zone that the user's in, you don't need it anyway.

As an alternative to all of that, avoid needing that string entirely and either get the date in ISO from the source server, or if the string came from some other piece of Javascript, just get that Date object and pass it directly to Moment.

snickersnack
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3

This comment highlights a problem with parsing timezones like "PST" moment.js - How to parse a date string string with a text timezone like 'PST'?

If you absolutely can't get the string in another format, you could do is split off the last three characters and do your own comparison against an object like so:

var testDate = "Jan 24, 2019 12:00 PST";
var timezones = {
    " GMT": " +0000",
    " EDT": " -0400",
    " EST": " -0500",
    " CDT": " -0500",
    " CST": " -0600",
    " MDT": " -0600",
    " MST": " -0700",
    " PDT": " -0700",
    " PST": " -0800"
};

const fixTimezone = dateStr => {
    let zone = dateStr.slice(-4);
    let time = dateStr.slice(0, -4);
    return time + timezones[zone];
};

let fixedDate = fixTimezone(testDate);
console.log(fixedDate);
console.log(
    moment(fixedDate)
        .tz("America/New_York")
        .format("MMM DD Y, hh:mm z")
);

Uses moment-timezone.

Should get Jan 24 2019, 03:00 EST

https://jsfiddle.net/ethantrawick/xectfsby/12/

Otoris
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