message: Exposed onDateChange method for ios
diff: @@ -27,6 +27,9 @@ export class DatePicker extends React.Component {
  setDate(date) {
  this.setState({ chosenDate: new Date(date) });
  + if (this.props.onDateChange) {
  + this.props.onDateChange(date);
  + }
  }
  showDatePicker() {
  