code: public static String secondsToUnits(int seconds, String unit) {
         if (unit == null) return String.valueOf(seconds);
         else if (unit.equals(INTERVAL_DAYS)) return String.valueOf(Math.round(seconds/86400));
         else if (unit.equals(INTERVAL_HOURS)) return String.valueOf(Math.round(seconds/3600));
         else if (unit.equals(INTERVAL_MINUTES)) return String.valueOf(Math.round(seconds/60));
         else  return String.valueOf(seconds);
     }
docs: Convert seconds to specified units
  @param seconds
  @param unit
  @return