gistfile1.java

public class TaxiCrewTime {
private String mTime;

// set, get, validate

 @Override
 public long getMilliseconds() {
     return calculateMilisecondTie(mTime);
 }
 
}
public class Dispatch implements Parcelable {

   ....
    @SerializedName("arrival_time")
    private TaxiCrewTime mArrivalTime;
 
    @SerializedName("accept_time")
    private TaxiCrewTime mAcceptTime;
   }
   }
   
   public class TimerPreference {
 
  public static void saveAcceptedTime(TaxiCrewTime time, Preference_ pref) {
         pref.orderAcceptedTime().put(time.getMilliseconds());
     }