WindowsLiveLogin::setOldSecretExpiry

function setOldSecretExpiry($timestamp)
{
	if (!$timestamp) {
		return;
	}

	if (!preg_match('/^d+$/', $timestamp) || ($timestamp <= 0)) {
		$this->fatal('Error: setOldSecretExpiry Invalid timestamp: '
		. $timestamp);
	}

	$this->_oldsecretexpiry = $timestamp;
}