Cactivedataprovider With Date Criteria

Hi,

Do you know what is problem in this:





        $criteria = new CDbCriteria;

        $criteria->addCondition('employee_id = :employeeId');

        $criteria->addCondition('date >= :startDate');

        $criteria->addCondition('date <= :endDate');

        $criteria->params = array(

            ':employeeId' => $model->employee_id,

            ':startDate' => $this->_startDate,

            ':endDate' => $this->_endDate,

        );

        $this->tasksByEmployeeDataProvider = new CActiveDataProvider('Task', array(

            'criteria' => $criteria,

            'pagination' => array(

                'pageSize' => 100,

            ),

        ));




If I comment the dates off, it works fine. But for some reason I get null result, If I add the dates in condition.