Regional settings such as currency, date or time format, and numbers are user profile-based.

In a Terminal Server or Citrix environment, users from different regions may want to retain their client-side regional settings when logging on to the server.

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Instructions

To set up the correct regional settings, complete the following procedure:

1. Log on to the Citrix server.

2. Select Start > Control Panel > Regional Settings.

3. Set the correct setting and log off so the setting is written to the user profile.

If users do not have access to the full desktop and are limited to initial or published applications, you may want to use one of the following methods:

Method 1

This method sets the user's regional options at log on by script:

1. Create global groups based upon the user's desired regional setting.

2. Create a test user for each global group.

3. Log on to the Citrix server with the test user created and make appropriate changes within the regional options.

4. Export the registry key HKEY_CURRENT_USER\Control Panel\International and import the registry key by using a logon script (set in GPO)

5. When users log on to the Citrix server, they inherit the regional settings based upon their group membership.
    

Method 2

Use Group Policy Preferences to push out the required settings in RDP/ICA sessions.

Under the "User Configuration\Preferences\Control Panel Settings\Regional Settings" you can add the settings for all users connecting to your VDA's.

You can refer to the below article to understand how to apply the Group Policy preference. Note that settings in this article are for IE. Use this is an example and configure "Regional Settings" accordingly.

Reference: https://support.microsoft.com/en-in/help/2898604/how-to-configure-group-policy-preference-settings-for-internet-explore


Method 3

This method allows you to publish the regional options GUI. This allows users to set their regional settings without full access to the server desktop:

Publish a new application with the following syntax on the server:
rundll32.exe shell32.dll,Control_RunDLL intl.cpl,,5
Working directory:
winnt\system32

Note: Instruct first time users to launch this published application to set their preferred regional settings.

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Regional settings such as currency, date or time format, and numbers are user profile-based. In a Terminal Server or Citrix environment, users from different regions might want to retain their client-side regional settings when logging on to the server.

Q325364 - HOW TO: Create a Custom Default User Profile in the Windows Server 2003 Family

924852 - How the "Regional and Language Options" settings in Windows Server 2003 are applied

http://support.microsoft.com/kb/973289