Date Compare in YII model search function

View : Search form

label($model,'fromdate'); ?>
          widget('zii.widgets.jui.CJuiDatePicker',array(
                                'id'=>'HolidayHolidayrange_fromdate',
                                'name'=>'HolidayHolidayrange[fromdate]',
                                'value'=>$model->fromdate==''?'':date('d-m-Y',strtotime($model->fromdate)),  
                                'options'=>array(
                                    'dateFormat' => 'dd-mm-yy',
                                    'showAnim'=>'slide',
                                    'showButtonPanel'=>true,
                                    'changeMonth'=>true,
                                    'changeYear'=>true,
                                    'yearRange'=>'1900:'.date('Y'),
                                ),
                                'htmlOptions'=>array(
                                    'style'=>'',
                                    'placeHolder'=>'End Date'
                                ),
                            ));
                            ?>
 

label($model,'todate'); ?>
                widget('zii.widgets.jui.CJuiDatePicker',array(
                                'id'=>'HolidayHolidayrange_todate',
                                'name'=>'HolidayHolidayrange[todate]',
                                'value'=>$model->todate==''?'':date('d-m-Y',strtotime($model->todate)),  
                                'options'=>array(
                                    'dateFormat' => 'dd-mm-yy',
                                    'showAnim'=>'slide',
                                    'showButtonPanel'=>true,
                                    'changeMonth'=>true,
                                    'changeYear'=>true,
                                    'yearRange'=>'1900:'.date('Y'),
                                ),
                                'htmlOptions'=>array(
                                    'style'=>'',
                                    'placeHolder'=>'End Date'
                                ),
                            ));
                            ?>
 

Model's Search function

public function search()
 {
           ....................
        if(!empty($this->fromdate))  
        $criteria->addCondition('fromdate > "'.date("Y-m-d",strtotime($this->fromdate)).'" ');
   
        if(!empty($this->todate))
        $criteria->addCondition('todate < "'.date("Y-m-d",strtotime($this->todate)).'" ');
         .......................
       }

Dropdown Filter in CGridView

$month_list=array('1'=>'JAN','2'=>'FEB');
$this->widget('zii.widgets.grid.CGridView', array(
 'id'=>'form-grid',
 'dataProvider'=>$model->search(),
 'filter'=>$model,
 'columns'=>array(
        array(
            'name'=>'festivals.festival_name',
            'filter' => CHtml::activeTextField($model, 'festival_name'),
            ),      
  'day',
        array(
            'name'=>'month',
             'value'=>function($data,$row) use ($month_list){
                            return $month_list[$data->month];
                        },
             'filter'=>CHtml::activeDropDownList($model,'month',$month_list,array('empty'=>'Select Month')),
            ),
...........