public class MainActivity extends AppCompatActivity {
String startTime = "";
String endTime = "";
....
....
....
public void dailyHours(){
//Retrieve clockInId (ObjectID for clockInTime)
ParseQuery<ParseObject> startQuery = ParseQuery.getQuery("clockIn");
startQuery.getInBackground(clockInId, new GetCallback<ParseObject>() {
    public void done(ParseObject clockIn, ParseException e) {
        if (e == null) {
            startTime = clockIn.getString("Time");
            Log.d(TAG, "StartTime: " + startTime);
        } else {
            // something went wrong
        }
    }
});

//Retrieve clockOutId (ObjectID for clockOutTime)
ParseQuery<ParseObject> endQuery = ParseQuery.getQuery("clockOut");
endQuery.getInBackground(clockOutId, new GetCallback<ParseObject>() {
    public void done(ParseObject clockOut, ParseException e) {
        if (e == null) {
            endTime = clockOut.getString("Time");
            Log.d(TAG, "EndTime: " + endTime);
        } else {
            // something went wrong
        }
    }
});

public void dailyHours(){
//Retrieve clockInId (ObjectID for clockInTime)
ParseQuery<ParseObject> startQuery = ParseQuery.getQuery("clockIn");
startQuery.getInBackground(clockInId, new GetCallback<ParseObject>() {
    public void done(ParseObject clockIn, ParseException e) {
        if (e == null) {
            startTime = clockIn.getString("Time");
        } else {
            // something went wrong
        }
    }
});
Log.d(TAG, "StartTime: " + startTime); //startTime returns an empty string when moved here