app/code/core/Mage/Eav/Model/Entity/Attribute/Backend/Datetime.php

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<?php
/**
 * Magento
 *
 * 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
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Eav
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

class Mage_Eav_Model_Entity_Attribute_Backend_Datetime extends Mage_Eav_Model_Entity_Attribute_Backend_Abstract
{
    public function beforeSave($object)
    {
        $_formated = $object->getData($this->getAttribute()->getName() . '_is_formated');
        if (!$_formated) {
            try {
                $value = $this->formatDate($object->getData($this->getAttribute()->getName()));
            } catch (Exception $e) {
                throw new Exception("Invalid date.");
            }
            $object->setData($this->getAttribute()->getName(), $value);
            $object->setData($this->getAttribute()->getName() . '_is_formated', true);
        }
    }

    /**
     * Prepare date for save in DB
     *
     * string format used from input fields (all date input fields need apply locale settings)
     * int value can be declared in code (this meen whot we use valid date)
     *
     * @param   string | int $date
     * @return  string
     */
    public function formatDate($date)
    {
        if (empty($date)) {
            return null;
        }
        // unix timestamp given - simply instantiate date object
        if (preg_match('/^[0-9]+$/', $date)) {
            $date = new Zend_Date((int)$date);
        }
        // parse this date in current locale, do not apply GMT offset
        else {
            $date = Mage::app()->getLocale()->date($date,
               Mage::app()->getLocale()->getDateFormat(Mage_Core_Model_Locale::FORMAT_TYPE_SHORT),
               null, false
            );
        }
        return $date->toString(Varien_Date::DATETIME_INTERNAL_FORMAT);
    }

}

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