Thanks for the help already, however I have a problem that also detect even be visible on the site own Telerik.
As the explanation of the case is kinda complicated, I will try to summarize and detail.
The control Calendars (RadDatePicker and RadTimeDatePicker) do not accept the displayed day on Sunday of Week 43 of the calendar, or any day that is existing in the sunday column in the third row of the calendar is not accepted.
Strangely components, subtract one day from the calendar, if that date is requested. For example the current anoa, the Sunday of the week 43 October is the day 21 (10/21/2012), but when you select that date The components alter the same to day 10.20.2012, even if the day is entered event occurs.
After some testing, I noticed that this only occurs in October, and only in week 43 and Sunday, regardless of the year.
Ask it to be seen, and if the pages can be observed: