As explained in our documentation, the Globalization() method of our ScriptRegistrar serializes some properties of the thread's CurrentCulture. This means that the DateTimePicker supports all languages (cultures) which the ASP.NET framework provides. Of course, one should also keep in mind that there are several countries in the world, which have not adopted the Gregorian calendar as their official calendar, so customizing for these countries may not be applicable in all cases.
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Greetings,
Dimo
the Telerik team
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