Hi Ramzan Pukhraj,
Thank you for writing. To check whether the current culture is "ar-SA" and then apply the new culture settings to RadCalendar, you can do the following:
if (CultureInfo.CurrentCulture.Name == "ar-SA")
GregorianCalendar calendar = new GregorianCalendar();
CultureInfo cinfo = new CultureInfo("ar-SA");
cinfo.DateTimeFormat.Calendar = calendar;
this.radDateTimePicker1.Culture = cinfo;
Please contact us again if you need more information.
the Telerik team
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