Zend_Date returns +00:00 instead of Z:
$date = $order->getCreatedAtStoreDate();
$date->setTimezone('UTC');
$date->toString(Zend_Date::ISO_8601)
// Returns: 2011-07-21T15:18:36+00:00
Wanted: 2011-07-21T15:18:36Z
Anyway I can make Zend_Date to use Z?
I got a workaround with str_replace('+00:00', 'Z', $date->toString(Zend_Date::ISO_8601))
but I don't like that.