This is just a helpful tip should anyone else run into this problem.  When 
using MS SQL 2012 (may also happen with 2010 and 2008) and the DAL's 
executesql() feature, if your query includes data type columns they'll have 
a tendency to be pulled in by pyodbc as unicode strings rather than dates. 
To resolve this, when you initialize your database connection just add an 
extra driver_arg to specify "{SQL Server Native Client 10.0}"

db = DAL('mssql://username:password@server/database', lazy_tables=True, 
driver_args=dict(Driver = '{SQL Server Native Client 10.0}'))

See also 
https://stackoverflow.com/questions/7172540/pyodbc-returns-sql-server-date-fields-as-strings
 

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