I just wrote a little piece of code to show the server time in a webpage. At the moment I just have one machine so I cannot test if the code is working.
Is there a way to tell the browser to use a time configuration different from the one configured in the OS? I have used plugins for Firefox to test different locales, I wonder if there are similar options for time tests.
Thanks.
Create a new empty directory for a separate Chrome user profile. E.g. with
mkdir ~/chrome-profile
You specify the TZ environment variable. You can see the valid timezones for example here, in column TZ.
To start Chrome, use these commands:
for Mac OS X: TZ='US/Pacific' open -na "Google Chrome" --args "--user-data-dir=$HOME/chrome-profile"
for Linux: TZ='US/Pacific' google-chrome "--user-data-dir=$HOME/chrome-profile"
Unfortunately, JavaScript is only aware of the current time zone, as it is set by the operating system. There are no facilities to let the Date object use a different time zone in a particular context. There are some libraries to do time zone conversions, but that won't help for what you are asking.
On Linux, Mac OSX, and other *NIX systems, you can set the TZ environment variable. See Benedikt Köppel's answer for details.
However, there is no facility for this on Windows. Some Windows programs may pick up on the TZ environment variable, but those that do will not necessarily interpret it correctly, as they aren't wired up to support IANA time zone names. More on this here and here.
You don't need to change OS variables or extensions to do this in 2021.
Chrome Dev Tools > Hamburger Menu > More Tools > Sensors
On the Location section select your location or give it a timezone id (e.g. America/Chicago, America/New_York)
On popular demand (kidding!), the explanation.
Google Chrome reads the environment variables to get the timezone its running in. Apparently all instances of Chrome share the value (not tested). In order to force a timezone, we need to a) set the environment variable to the timezone we want, b) kill all existing instances of Chrome, c) Print the current timezone to confirm, and d) Start Chrome with the intended timezone.
The below shell script is tested with OS X but should work for others too.
export TZ='US/Pacific'
killall Chrome
date
open /Applications/Google\ Chrome.app
Chrome seems to update its TimeZone as soon as you change it in Windows. Firefox seems to store the timezone value of the system at startup.
With Visual Studio it looks like you can turn the trick on its head. It seems that the Timezone is only read when you first start the debug process. So In my case, what I did was set the TimeZone to, for example, Eastern Standard Time. Start the Visual Studio debugger. I then changed the TimeZone to, for example, Pacific Standard time. The server at this point remained in the Eastern timezone, while my browser was in the Pacific timezone. Now I was able to test the client browser behavior just fine.
If you wanted to test a client in Japan, then just update your TimeZone and the browser will follow it. As long as you don't restart the debug process your server timezone will not change. Also just changing the time (as opposed to the timezone) did not work.
There is a lot of time zone extensions available to spoof in browser level. I am using currently
After adding click option of the extension and check
Once both done, Go to any website and open developer tools and check by executing below command
new Date().toLocaleTimeString()
Old question, but I had a similar issue and I'll throw my fix in anyways.
What I did was run my server in a virtual machine, set the network settings to bridged so that I'd be able to access the server from my host OS as the client easily.
I then changed time settings in the VM so that there was whatever difference I wanted between the client and server.
Maybe it will help someone. You can change time zone for Windows 10 using this steps:
Open Settings.
Click on Time & Language.
Click on Date & time.
Change time zone to your need.
P.s. According to the #Oscar Acevedo comment this answer is not quite correct. It's suitable for testing different time zones.
This an easies way I tried to chang time zone and test it for windows 7 ^
I use tzutil
tzutil /s "Eastern Standard Time"
and save it to suitable .bat file e.g Eastern_Standard_Time_zone.bat and use default_time_zone.bat conain your original system time zone to get it back after finishin tesing . this will change your time zone in blink .
reference
If you are into reproducibility, I suggest that you use an e2e environment, i.e. tooling that can automate browsers and allows to manipulate their time zone.
That way you won't have to fiddle around with the system time zone and you can add tests, that specifically do use different time zones, i.e. you can test your code in different time zones.
Two of the most recent popular libraries for browser automation, Puppeteer and Playwright explicitly allow setting the time zone. Using Playwright you get the ability to automate setting the time zone for all major evergreen browsers (Safari, Firefox and Chrome / ChromeEdge):
for Puppeteer you have to use page.emulateTimezone
for Playwright you have to use a newContext
You're probably better off leaving your computer timezone intact and changing your server settings to reflect a timezone ahead or behind of you. This is usually pretty easy to do depending on the server you're using.
I'm currently having an issue with the wrong timezone displaying on a web page. I support a Linux environment for a small app development team. Currently we are testing a particular app. For test purposes we have a simple web page showing that the app is live and working. The page itself displays the project title and server time.
This issue is that the web page displays the incorrect timezone, however the time itself is correct.The text displayed is "The time on the server is April 5, 2018 7:18:04 AM CDT." For context I've included a screen shoot.
time zone issue
Nothing special going on here. As I said the time is technically correct, but it's displaying Central time when I need it to show Eastern, because the people using the app will be located in the Eastern timezone.
I support the environment itself and am not a developer. However, after speaking with them they ensure me that whatever method is being called is pulling from the server time. I've tested this successfully and am able to manually change the time on the server that it is hosted on, and the web page will reflect that.
Within the environment we are using CentOS 6. Based on my research the timezone information is handled by the file "localtime" within the "etc" directory. I've used several methods to alter this file.
I've tried the following command:
cp /usr/share/zoneinfo/Eastern /etc/localtime
I've also tried variations of the command. The server shows the correct time and timezone, but the timezone displayed on the web page never changes.
We have two servers to host apps. The interesting this is that apps that are hosted on the other server are being displayed correctly with the Eastern timezone. I've also tried simply taking the "localtime" file on the correct server, and copying it to the other server within the /etc/ directory. With each attempt doing a server restart.
I realize this is a simple issue, but after trying multiple methods with no success I thought I would seek assistance. Any help is appreciated.
I am running a large Grails app on a CentOS server.
The server is set to EST (GMT - 5).
When I deploy the app (as a war file), the app's date and time will be correct for a few days, and then suddenly the app becomes confused and thinks it is in GMT, not EST.
This causes dates on domain objects to be incorrect, and also causes Quartz jobs to run at the wrong time. For example:
We have a job that runs daily at 6:15AM EST and sends out reports by
email. This happens at the correct time for a few days after
deployment, and then suddenly the daily job starts running at 1:15AM
instead.
Date fields displayed with g:formatDate will show GMT instead
of EST but the hours / minutes / seconds in the date itself don't
change, so every time the record is saved the date ends up being
pushed forward five hours.
Currently running Grails version 2.4.4, Apache Tomcat/8.0.15, OpenJDK 1.8.0, but we experienced the same behavior with various 2.3.x versions of grails, Tomcat 7, and Java 7.
I'm still not sure if this is a Grails problem, or a Tomcat problem. Any ideas how to troubleshoot it would be greatly appreciated.
As it turned out the problem was the use of TimeZone.setDefault() somewhere in the code.
Modifying global state like this anywhere in an application is extremely dangerous!
Even if used in code, that is at first glance "protected" by something like this old = current(); set(new); dostuff(); set(old), is likely to break (but much harder to catch) as it does the change for a short time period and errors around it get more obscure. Exceptions will do the rest...
I have a third party application with a known bug in their date handling. I can work around the bug by ensuring the timezone is UTC.
The application is an EJB in an ear which we deploy on Weblogic 11g.
To date I have managed this by setting the default timezone for the server to UTC.
However, I now want to deploy this application on server where other applications exist that require a different default timezone.
Is there any way to specify timezone = UTC for this application only?
(I have limited access to the workings of the EJB i.e. there are some hooks for user provided java code)
Thanks.
Have you tried setting the default timezone each time the EJB starts? (if that's possible with your hooks)
// create time zone object
java.util.TimeZone tzone = java.util.TimeZone.getTimeZone("America/Los_Angeles");
// set time zone default
java.util.TimeZone.setDefault(tzone);
List of possible timezones and names:
http://en.wikipedia.org/wiki/List_of_IANA_time_zones
i'm using linkedin gem for my RoR application, it's running fine on my local and stagign(it's live with dummy data only for testing) but on Production i'm having Oauth::timestamp refused error. My Staging and Production servers are using +0000 zone settings and i have no idea how to resolve this thing. Please let me know how to fix this.
Note that you can find out the current timestamp on the LinkedIn servers by sending a HEAD request for one of the resources. In python this could be:
import httplib
conn = httplib.HTTPConnection("api.linkedin.com")
conn.request("HEAD", "/v1/people/~")
resp = conn.getresponse()
print resp.getheaders()
You could then use this date to set the date for your application for subsequent calls. This is helpful when you don't have root access on the system (or know how to set the time/date)
Your date on the server is likely incorrect. You can read about the timestamp in the oauth specification here. It needs to be within 5 minutes of LinkedIn's server time.
You can find it out by typing:
date
And set it by using:
date -s "17 Jan 2012 13:00:00"
Your linked profile time zone and your rails app time zone configuration is not same. Check your linked in profile time zone what you have setted for your profile or may be location and set time by location on config/application.rb.
I just resolved this problem by set my time zone.