[Fwd: Why "to_date" is not working with pypgsql?]

Why the query "select starttime from dataproduct" is working fine with 
pypgsql, but the query "select to_date(starttime, 'DD-Mon-YYYY') from 
dataproduct" is not? What is the problem with the 'to_date"?

Any one can help? Please. Thank you!

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