Thank you for contacting us.
To customize the date format of the DatePicker you can try setting its Culture
property, for example like so:
datePicker.Culture = new System.Globalization.CultureInfo("en");
For more information about CultureInfo
class and the possible formats of the date you can refer to these articles:
If you need further assistance please feel free to contact us again.
All the best,
the Telerik team
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