Soap

Olá

estou tentado fazer um SOAP para "https://homologacao.pagador.com.br/pagadorV15/transaction/pagadortransaction.asmx?WSDL", executando a função "AuthorizeTransaction" e passando o parametro "MerchantLocalDate" com o valor "14/01/2011 01:27:34" (por exemplo).

O retorno é:

'message' => 'System.Web.Services.Protocols.SoapException: Server was unable to read request. ---> System.InvalidOperationException: There is an error in XML document (2, 952). ---> System.FormatException: The string \'14/01/2011 01:27:34\' is not a valid AllXsd value.
at System.Xml.Schema.XsdDateTime..ctor(String text, XsdDateTimeFlags kinds)
at System.Xml.XmlConvert.ToDateTime(String s, XmlDateTimeSerializationMode dateTimeOption)
at System.Xml.Serialization.XmlCustomFormatter.ToDateTime(String value)
at System.Xml.Serialization.XmlSerializationReader.ToDateTime(String value)
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReader1.Read3_PagadorAuthorizeRequest(Boolean isNullable, Boolean checkType)
at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReader1.Read11_AuthorizeTransaction()
at Microsoft.Xml.Serialization.GeneratedAssembly.ArrayOfObjectSerializer.Deserialize(XmlSerializationReader reader)
at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
--- End of inner exception stack trace ---
at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)
at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle)
at System.Web.Services.Protocols.SoapServerProtocol.ReadParameters()
--- End of inner exception stack trace ---
at System.Web.Services.Protocols.SoapServerProtocol.ReadParameters()
at System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()',
'string' => '',
'code' => 0,

Pergunta: para q não dê esse erro, qual o formato correto que deveria passar?