Failed to get Column's data type in Oracle 11g

Hi,
I made an ADO connection(Oracle provider) to Oracle 11g, and use ADO API: OpenSchema(adSchemaColumns) to fetch the columns' info. But I found I couldn't get the column's data type if it's type is timestamp or timestampwithtimezone in database. What I got is 'adIUnknown' whose number is 13.
I test with another column whose data type is 'date', and everything is ok. I get the data type 'adDBTimeStamp'.
This issue occurs on Oracle 10g, too.
Can anyone offer some help? Thanks a lot!

See
http://www.oracle.com/technology/tech/windows/odpnet/index.html
http://download.oracle.com/docs/cd/B28359_01/win.111/b28431/using.htm#CHDJJDAJ

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