react-best-pratices.jsx

const DatePicker = (props) => <input type="date" onChange={props.handleDateSelected}/>

class DatePickerController extends React.Component {
  constructor (props) {
    super(props);
    this.state = { currentDate: null };
    this.handleDateSelected = this.handleDateSelected.bind(this);
  }

  handleDateSelected ({target}) {
     this.setState({ currentDate: target.value });
  }

  render () { 
     return <DatePicker handleDateSelected={this.handleDateSelected}/>;
  }
}

export const DatePickerContainer = connect(mapStateToProps, mapDispatchToProps)(DatePickerController);

ReactDOM.render(
  <DatePickerContainer/>,
  document.getElementById('app')
);