Localization at the server and application level
Selecting your server's default localization settings
In Site Admin, you can specify which will be the default settings for all your applications and server.
If you set a localization at the server level, all the new applications you create will have that localization setting by default.
In Site Admin, go to Settings > Localization and specify the language, measurement, time zone, etc. for your application.
Note that you can also set the default language and address format for your geocoder on this screen, too.
Localization settings per application
The localization settings can also be modified at the application level. This means that each of your customers could have different localization settings if needed. This could be useful if you have customers in different countries or time zones.
To change this setting, click on your application name
Now edit the Localization settings for your application under the Localization category
Finish by clicking on Save.
Note: changing the localization settings for an application will apply those settings to all users of that application. Is not possible to have different time zones, units of measurement, culture, etc. per user. However, you can apply language settings on a per-user basis.