React-native-datetimepicker was recently released as a react-native-community project.
It would be good to be able to use it via Expo (since otherwise we have to eject to use it). This cross-platform datetime picker is meant to consolidate the RN DatePickerIOS, DatePickerAndroid and TimePickerAndroid modules and to spin those out of RN core as part of the ongoing lean core initiative, so expect those core pickers to be deprecated in the future.