I'm trying to get the leads that were changed for a specific date.  Like below.
	$leadSel->oldestUpdatedAt = '2014-08-25T00:00:00-05:00';
	$leadSel->latestUpdatedAt = '2014-08-25T23:59:59-05:00'; 
	$leadSelSoap = new stdClass();
	$leadSelSoap = array("leadSelector" => $leadSel);
	$leadSelSoap = new SoapVar($leadSel, SOAP_ENC_OBJECT, $selector, "http://www.marketo.com/mktows/");
	$params->leadSelector = $leadSelSoap;
	$params->batchSize = 100;
	If I look in the Marketo UI there are 5 leads for this date but the call returns over 10,000.  If I do the same call for yesterday the UI shows 20 leads and the API return 10.