Changing the Date/Globalisation Settings on CRM Servers

Web Forms configuration files, named Web.config, provide settings for every Web Forms page in the same directory as the configuration file. The settings are usually also inherited by subdirectories. Each file can contain a globalization section in which you can specify default encodings and cultures. Values are valid if they are accepted by the related Encoding and CultureInfo classes.

Set the values of culture and uiCulture.

fileEncoding="utf-8"
requestEncoding="utf-8"
responseEncoding="utf-8"
culture="en-US"
uiCulture="de-DE"
/>


http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vbtskeditingwebconfigfileforwebformsglobalization.asp