Merge pull request xgfe#194 from bed42/master

if timezoneOffset is undefined, pass null to the iOS dateTime picker.…

Author: feyy

datepicker.js

@@ -397,7 +397,7 @@ class DatePicker extends Component {
                         maximumDate={maxDate && this.getDate(maxDate)}
                         onDateChange={this.onDateChange}
                         minuteInterval={minuteInterval}
-                        timeZoneOffsetInMinutes={timeZoneOffsetInMinutes}
+                        timeZoneOffsetInMinutes={timeZoneOffsetInMinutes ? timeZoneOffsetInMinutes : null}
                         style={[Style.datePicker, customStyles.datePicker]}
                         locale={locale}
                       />