/** @see at.spardat.enterprise.fmt.IFmt#isLegalInternal(String) */
 public boolean isLegalInternal(String internal) {
   return TimeStampUtil.internal2Date(internal) != null;
 }
 /** @see at.spardat.enterprise.fmt.IFmt#format(String) */
 public String format(String internal) {
   if (internal == null || internal.length() == 0) return "";
   return dateFormat_.format(TimeStampUtil.internal2Date(internal));
 }