How to get value of inputted date?

Got a question. How do I get the value of the inputted date on the onChange event? 
I'm using react hook
`const [currentDate, setNewDate] = useState("")`
Here's the code
`<SemanticDatepicker onChange={evt => setNewDate(evt.target.value)}/>`

I tried following the example in the Codepen with `onDateChange` but that doesn't seem to work in the new version. 
