Hello! Please have a look on https://www.osm.org/node=12820914733, https://www.osm.org/node/12820914734. What is the difference between naptan:ModificationDateTime and (the standard key) naptan:ModificationDate ? 
I also wonder what information the tag naptan:Modification = new provides if the date is not also logged? Please only transfer the really relevant information from a data source.