If you want to change the date format of GroupCalendar, you only have to change the Culture Info.
The Culture Info represents information about a specific culture including the names of the culture, the writing system, and the calendar used, as well as access to culture-specific objects that provide information for common operations, such as formatting dates and sorting strings.
To change the Culture Info in GroupCalendar, navigate to the localization folder in the GroupCalendar installation path.
For example: C:\Program Files (x86)\PTM EDV-Systeme GmbH\GroupCalendar for MS CRM 2011\localization
Next, open the XML Document which concerns your language settings (for example: en.xml for english).
Replace the value of the culture key with the desired Culture Info. (For example: en-US could be replaced with en-GB). Click here to view the culture keys.
For more information about CultureInfo-Class, refer to this article.
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