One way to display only the time part is as follows:
$sTime = Mage::app()
->getLocale()
->date(strtotime($order->getCreatedAtStoreDate()), null, null, false)
->toString('H:m:s');
$page->drawText($sTime, 100, 100, 'UTF-8');
Magento locale uses a modified class Zend_Datefor date and time operations.
Refer to the toString()method app/code/core/Zend/Date.phpfor parameter information.
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