When SelectionEnd is equal to PeriodEnd, and PeriodEnd is at midnight (00:00:00), then selection title shows incorrect selection end. To reproduce consider the following xaml: <telerik:RadTimeBar PeriodStart="1-Jan-2010 12:00:00 AM" PeriodEnd="31-Dec-2011 00:00:00 AM" SelectionStart="1-Jan-2010 12:00:00 AM" SelectionEnd="31-Dec-2011 00:00:00 AM" SelectionTitleFormatString="{}{0} - {1}" /> PeriodEnd == SelectionEnd == 31-Dec-2011 00:00:00 AM, but title is: "01/01/2010 00:00:00 - 30/12/2011 23:59:59" As in our app we display date with "dd MMM yyyy" format, the displayed selection end differs by one day from the real one, which is a serious issue.