How to convert Firebase child name into date and time - date

Question

I have a basic app that has RecyclerView for getting data from a Firebase database, which looks like this:
I would like to have the 20170108_100 converted into data and time format (08/01/2017 10:00), which can then be compared to the actual date.
I'm planning to have some IF conditions in order to sort the database by date&time and I need to have something like this:
if (20170108_100 < CurrentDate&Time) then doSomething else doSomethingElse
Is there any way one can do that?
So far, I have this code that reads that database:
public class Hotarari extends Fragment {
View v;
ProgressDialog progress;
private FirebaseRecyclerAdapter < Variabile_primarie, ContactViewHolder > cc;
private RecyclerView mContactRV;
private DatabaseReference mPostRef;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, Bundle savedInstanceState) {
v = inflater.inflate(R.layout.fragment_hotarari, container, false);
return v;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
this.v = view;
initialiseScreen();
}
private void initialiseScreen() {
mContactRV = (RecyclerView) v.findViewById(R.id.contact_recyclerview);
mContactRV.setLayoutManager(new LinearLayoutManager(getContext()));
mPostRef = FirebaseDatabase.getInstance().getReference("-DeciziiPrimari");
setupAdaptater();
mContactRV.setAdapter(cc);
}
private void setupAdaptater() {
cc = new FirebaseRecyclerAdapter < Variabile_primarie, ContactViewHolder > (
Variabile_primarie.class,
R.layout.item_hotarari,
ContactViewHolder.class,
mPostRef
) {
#Override
protected void populateViewHolder(ContactViewHolder viewHolder, final Variabile_primarie model, int position) {
viewHolder.setData(model.getData());
viewHolder.setNumar(model.getNumar());
viewHolder.setHotarare(model.getHotarare());
}
};
}
public static class ContactViewHolder extends RecyclerView.ViewHolder {
private TextView tv_hotarare;
private TextView tv_data;
private TextView tv_numar;
public ContactViewHolder(View itemView) {
super(itemView);
tv_hotarare = (TextView) itemView.findViewById(R.id.continut_hotarare);
tv_data = (TextView) itemView.findViewById(R.id.data_hotarare);
tv_numar = (TextView) itemView.findViewById(R.id.numar_hotarare);
}
void setHotarare(String hotarare) {
tv_hotarare.setText(String.valueOf(hotarare));
}
public void setData(String data) {
tv_data.setText(String.valueOf(data));
}
void setNumar(String numar) {
tv_numar.setText(String.valueOf(numar));
}
}
}