I can suggest you to create a custom TimeRulerItemStyleSelector and add a custom MajorHorizontalTimeRulerItemStyles in which you can modify the ControlTemplate in order to display a TextBlock with the required text. For your convenience I have created a custom project which demonstrates the explained approach above (please note that we have used Implicit Styles to style the project). For more information about Styling the TimeRulerItems you can check the following article from our online help documentation: http://www.telerik.com/help/wpf/radscheduleview-styles-and-templates-styling-timeruleritems.html
Hope this will help you.
Regards,
Kalin
Telerik
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