docs: @Nullable
      public Date getDateOriginal(@Nullable TimeZone timeZone)
      {
          TimeZone timeZoneOriginal = getTimeZone(TAG_OFFSET_TIME_ORIGINAL);
          return getDate(TAG_DATETIME_ORIGINAL, getString(TAG_SUBSECOND_TIME_ORIGINAL),
              (timeZoneOriginal != null) ? timeZoneOriginal : timeZone);
      }