Thank you for your interest in RadCalendar.
We have been able to reproduce the issue with the cultures and we are going to fix it for the Service Pack, expected next week. As to the current date, we are using DateTime.Today to get the value of Today and we don't provide a way to manually edit this value.
I have added some Telerik points to your account for reporting the issue and for your suggestion.
the Telerik team
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