code: public Date getTimestamp(FastTrackField dateName, FastTrackField timeName)
     {
        Date result = null;
        Date date = getDate(dateName);
        if (date != null)
        {
           Calendar dateCal = DateHelper.popCalendar(date);
           Date time = getDate(timeName);
           if (time != null)
           {
              Calendar timeCal = DateHelper.popCalendar(time);
              dateCal.set(Calendar.HOUR_OF_DAY, timeCal.get(Calendar.HOUR_OF_DAY));
              dateCal.set(Calendar.MINUTE, timeCal.get(Calendar.MINUTE));
              dateCal.set(Calendar.SECOND, timeCal.get(Calendar.SECOND));
              dateCal.set(Calendar.MILLISECOND, timeCal.get(Calendar.MILLISECOND));
              DateHelper.pushCalendar(timeCal);
           }
  
           result = dateCal.getTime();
           DateHelper.pushCalendar(dateCal);
        }
  
        return result;
     }
docs: Retrieve a timestamp field.
  
  @param dateName field containing the date component
  @param timeName field containing the time component
  @return Date instance