[SOAP] NUSOAP datetime UTC issue

I am calling a SOAP web service using the nusoap class library, I am able to
call the web method correctly however 1 of the parameters that i must pass
in is a datetime in UTC format. i can create the correct format and time in
my client code.
eg. 2008-04-11T10:00:25 00:00
however when i pass this datetime into the soap method nusoap alters the
datetime to the one based on my local machine (BST). 
A simplified version of the code i am using is:

                //create date in correct format 2008-03-17 14:29:36Z
		date_default_timezone_set('UTC');
		$date = new DateTime();
			
		$params = array(
			'Username'         => $username,
			'RequestDateTime'  => $date->format(DATE_RFC3339),
			'ClientId'         => $clientId,
		);
	
		$wsdl="http://localHost/twoFac/service.asmx?WSDL";
		$soapclient = new soapclient($wsdl,true);
		
		$proxy = $soapclient->getProxy();
		$result = $proxy->ValidateFirstFacPassword($params);

All other variables are sent unaltered.
Thanks in advance Nigel. 

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