By design, when the TimePicker (and other date/time pickers) is bound to a non-nullable value, pressing the clear button clears the input only and sets the component in invalid state. In this case, ValueChanged and OnChange events do not fire and the component keeps its old value until a new valid value is entered.

I want to catch when the user presses the clear button. Instead of clearing the input, I want to reset the value to 00:00:00, so the component is still in a valid state.

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ADMIN EDIT

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For the time being, you can disable the built-in clear button. Instead, add a custom button/span, use CSS to position it inside the picker's input and handle its onclick event: https://blazorrepl.telerik.com/QTabvxPz46eLPVvJ00.

This request can potentially be related to providing an option to also detect when the user clears the value via the keyboard.

The request applies to all pickers (DateInput, DatePicker, DateRangePicker, DateTimePicker).