Globalized applications use the DateTimeOffset type instead of DateTime since it includes the offset from UTC for different time zones. If DateTimePicker could bind to this type it would simplify UI development. It would have to have the offset or timezone value provided as either a property or as a second binding.

Need a feature  to restrict the days to be displayed in the Kendo UI datetime pickers control.

 For example .   I want to only display say  dates than falls only on Thursday and Sunday  where users can select on that dates and the other dates to be disabled or invincible.

 I want to have a flexibility to change it to other days as well.

DatePicker should let developer decide if the chosen day of the month should be persisted from month-to-month.

By default the DatePicker remembers the day of the month the user has selected, and that day gets styled differently even when the user navigates away to a different month: the user selects January 12th and then navigates to August, and the 12th day of August is styled differently too.

But there are many use cases for a DatePicker where it is not appropriate behavior to remember the previously selected day of the month when the user navigates to a different month. Remembering the day can actually make things confusing for the user in applications where this behavior is not the right behavior.

Add the option to be able to highlight today's date in calendar and date pickers.

Sometimes it's useful to limit users to only selecting a certain day of the week. This is possible with jQuery UI but not, AFAIK with Kendo.

Many calendars have the ability to show a column of ISO week numbers alongside the dates (either to the right or the left).  Although it's not a show stopper I have such a requirement in my current project.  While other controls offer this there are none I know of which permit custom calculation of the week number - another requirement for this project.

It would be great if we can have the option to have a multi-month view calendar.  Like the one in the asp.net ajax suite.
 
http://demos.telerik.com/aspnet-ajax/calendar/examples/functionality/multimonthview/defaultcs.aspx

Would like Timepicker that works the same as your Windows Forms Timepicker, with a SpinEditor.

Add a multiple date selection to the Calendar. A multiple date selection calendar is very important for professional web applications in many situations. Also, there is a lack of events in the API.
It is always important to provide more events then less.

Here a few suggestions:
Property year;    /// Year displayed by control.
Property month; /// Month (1 to 12) displayed by control.
A method in the API to easily get the selected date(s).
A method in the API to easily set the selected date(s).
An option to indicate if we allow/disallow multi-selection.
A callback event (and passing the data as an argument) when a date is selected/unselected to allow/disallow the selection/deselection (by returning a true/false). This would allow to easy show a warning message when some dates are selected/unselected. We may currently do part of it in the change event but adding events onbefore/onafter selection would be nice.
Add the option to hide/show days from previous/next month.
Add the option to enabled/disable click from previous/next month.
The Year selection on the top should be a combo that allow keyboard input.
You may check the Yahoo Calendar event & properties. It will provide a good examples (http://developer.yahoo.com/yui/docs/YAHOO.widget.Calendar.html)