Thank you for contacting us.
This is because that is the default count of the weeks. Actually the first week of 2010 contain just three days - 1st, 2nd and 3rd January.
The way to change that is to use a DayTemplateSelector
for the DatePicker.
Attached I am sending you a sample project in which the use of the DayTemplateSelector is illustrated. There in the WeekHeadersSelector
class you can implement a logic that will add 1 to each week number.
You can see an example how the DayTemplateSelector is used also in this online demo
Hope this helps.
If you need further assistance please let us know.
All the best,
the Telerik team
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