<?php
/**
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 *
 * @category   BL
 * @package    BL_CustomGrid
 * @copyright  Copyright (c) 2012 Benoît Leulliette <benoit.leulliette@gmail.com>
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

class BL_CustomGrid_Block_Widget_Grid_Column_Filter_Datetime
    extends Mage_Adminhtml_Block_Widget_Grid_Column_Filter_Datetime
{
    public function getValue($index=null)
    {
        if (is_array($value = $this->_getData('value'))) {
            if (!empty($value['to']) && !($value['to'] instanceof Zend_Date)) {
                $value['to'] = null;
                $this->setData('value', $value);
            }
        } else {
            $this->setData('value', null);
        }
        return parent::getValue($index);
    }
}