I am uncertain which exactly version of Telerik.UI are you using but still with the most recent versions WAVE validation error should not be occurring. Still there are two approaches you can try and let us know of the results:
- Use AssociatedControlID="rtStartTime_DateInput" instead of AssociatedControlID="rtStartTime;
- There is no explicit need of using an “external” label as the DatePicker and DateInput controls have a DateInput-Label property. It is meant to be used in scenarios where additional labels are needed.
In addition could you try reproducing the errors you get on our online demo for TimePicker/DateTimePicker – Accessibility
. In case you succeed, please send us the exact steps that need to be followed. This way we can further analyze the potential problem and advice you.
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