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.

Per default, GroupCalendar will show 10 days prior to the license expires a notification to all users (see Figure 1).

Figure 1: GroupCalendar expiration

The notification can be limited to specific users and you can set the date of its first appearance.

· Open your CRM
· Go to Settings in the navigation at the left
· Select mscrm-addons settings from the navigation
· Click on the Dashboard row at the right grid and open it.  

Figure 1: mscrm-addons.com settings