Dates need to be newed

src/order/CreateOrder.js

@@ -124,7 +124,7 @@ class CreateOrder extends React.Component {
                 type="date"
                 value={date2string(this.state.deadline)}
                 onChange={(e) =>
-                  this.setState({ deadline: Date(e.target.value) })
+                  this.setState({ deadline: new Date(e.target.value) })
                 }
                 min={date2string(daysAfterNow(1))}
               />