When you set, for example, DisplayDateStart to 1/1/2011, DisplayDateEnd to 1/1/2012 and DateSelectionMode to Year, the RadDateTimePicker displays 2010 too. You can interact with the years within the range but not with the additional one. The way to avoid this activity is to set DisplayDateStart to 2/1/2011 (according to the given example) but the day corresponding to the 1/1/2011 will not be included.

For example after entering "7 July 2014" hitting the enter keyboard key causes ArgumentOutOfRangeException