How to get to the Hanging Temple and Yungang grottoes in Datong from Beijing?

Hi, My boyfriend and I will be in beijing in october and we would like to visit The Hanging Temple and Yungang grottoes in Datong . We can visit them on the same day? How long does it take? And what advice do you ride? We think we have to take the train Beijing - Datong on the night of 22 oct. to arrive at about 5 am on 23 oct. and then take the train after visiting the temples in the evening. Thank you!!