Clear Perspective DateTime Input

I’m using Ignition 8.0.4 and the Perspective DateTime Input object. I have two inputs controlling the range for a Time Series Chart object. I’d like to have a reset button on the page to clear the contents of the DateTime Input object. I’ve tried adding an “onClick” event to the button this this code:

self.parent.parent.getChild("DateTimeInput_StartDate").props.formattedValues.datetime = ""

The Time Series Chart object will clear as I would like, but the old date/time remains in the DateTime Input. How can I clear the contents of the DateTime Input?

self.parent.parent.getChild("DateTimeInput_StartDate").props.value = None