Why DBA_OBJECTS.TIMESTAMP is defined as VARCHAR2(19)

Oracle recomends to use TIME STAMP datatypes for timestamp information but itself it is using VARCHAR2(19) for DBA_OBJECTS.TIMESTAMP can any body explain Why it is so?
Oracle version is 10.2.0
thanks in advance.

DBA_OBJECTS is a view. The source is sys.obj$.stime, which is of type date. The Created and Last DDL are also of type date and are carried through as date.
Conclusion: Because Oracle wanted to ensure you see the HH24:MI:SS portion and regular dates will display based on the NLS_DATE_FORMAT of the database.

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