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<?php
/**
 * Zend View Helper Convert Date
 * 
 * @author      Niels Lange <info@semanticsamsterdam.nl> * @copyright   semantics   <info@semanticsamsterdam.nl>
 */
class Zend_View_Helper_ConvertDate extends Zend_View_Helper_Abstract
{
   /**     * Convert date
     * 
     * Converts yyyy-mm-dd to dd-mm-yyyy resp. dd-mm-yyyy to yyyy-mm-dd
     * 
     * @param string $date     */
    public function convertDate($date)
    {
        if (preg_match('/^(\d){4}(-)(\d){2}(-)(\d){2}$/', $date)) {
            return substr($date, 8, 2) . '-' . substr($date, 5, 2) . '-' . substr($date, 0, 4);        } elseif (preg_match('/^(\d){2}(-)(\d){2}(-)(\d){4}$/', $date)) {
            return substr($date, 6, 4) . '-' . substr($date, 3, 2) . '-' . substr($date, 0, 2);
        } else {
            return null;
        }    }
}