Using DateTime under db4o with native SODA queries? -

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under db4o, i'm attempting constrain "new datetime(2010,10,14)" doesn't seem work - opinions on how fix this?

got it: 

var query2 = db4o.db.query(); query2.constrain(typeof(tradingday)); query2.descend("_date").constrain(new datetime(2010,10,14)); iobjectset result2 = query2.execute();

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