public Check3DateCommand(FormatChecker checker) : base(checker)
 {
 }
 public CheckSecondDateCommand(FormatChecker checker) : base(checker)
 {
 }
 public CheckLengthCommand(FormatChecker checker) : base(checker)
 {
 }
 public CheckHeadCommand(FormatChecker checker) : base(checker)
 {
 }
 protected CheckCommand(FormatChecker checker)
 {
     Checker = checker;
 }