How do I test my browser timezone dependent application againts different timezones? [duplicate]

Question

I'm making a Javascript web application that depends on user's browser time zone.

For example, whenever I check the UTC offset, I find it to be +5.5 only.

How do I test if it works in other time zones as well? I specially want to see how it works with US time zones.

I use Firefox mostly. Is there any configuration setting I can edit? I tried changing my system time zone, but it didn't work.

Styria

On Firefox 45.0.1 + Windows 7, changing system timezone and refreshing works (at everytimezone.com for example). – Angeliqueangelis

@S.Kirby, A refresh will work. – Cobble

Answer 1

You need to restart your browser after you change your system's timezone. Firefox keeps the original timezone, I believe, and Chrome thinks you are in UTC if you do not restart.

Foreordination

...or simply open another instance of FF or Chrome if (like me) you're a tab hoarder :-) – Alleged

In Chrome at least, I don't need to restart the browser. Simply close the tab and then reopen it. – Specialism

I'm on Ubuntu, simple (F5) refresh worked for me in Chrome. – Gegenschein

Is there anything we can do with Developer Tools on Chrome to spoof System Timezone? – Eurythmic

@RaviDhoriya , Yes definitely. Is there a way to set arbitrary timezones? For example +15:00 (which doesn't exist since 14 is max) and "subdecimals" like +08:12:04.3384. This would be useful to do "ease testing". – Cobble

Answer 2

In this regard, I've used this script on OS X: fresh-chrome-with-custom-tz.sh

The script starts an instance of Chrome with its own environment. To configure it to use a specific timezone, edit this in the script:

# Change this to the spoof a different timezone. Helpful for testing timezone specific client facing content.
export TZ="America/Los_Angeles"

It relies on the TZ environment variable. Works like a charm!

Beastly

Great solution! – Lupus

Made my life a lot easier! – Rutherfurd