[Zope] Date Problem of ODBC DA

Hi, I access the data in Oracle 7.3(AIX server) through ODBC DA on NT platform. Things work well unitl the table has column with DATE type. When my SQL method is "select start_date from project_table", and test it in Zope 1.10.2, I get only "Sorry, an error occurred.". Is it a problem of Zope or ODBC DA? How to fix it? T. C. Huang