Soap parameter type DateTime on wsdl

[fregian]

Hello,
i have generated class by wsdltophp and all is ok, but now I need to use a method that requires two parameters of type DateTme and defined in the wsdl as:
<xs:element name="arg4" type="xs:dateTime" minOccurs="0" />
<xs:element name="arg5" type="xs:dateTime" minOccurs="0" />
The method generated by wsdltophp defines ar4 and arg5 as string.
Whatever value I pass to the method, the ws receives NULL,
How can I solve?

this is the code on generated class:
/**
* Set arg4 value
* @param string $arg4
* @return \StructType\GetDocumentIdsList
*/
public function setArg4($arg4 = null)
{
// validation for constraint: string
if (!is_null($arg4) && !is_string($arg4)) {
throw new \InvalidArgumentException(sprintf('Invalid value %s, please provide a string, %s given', var_export($arg4, true), gettype($arg4)), LINE);
}
$this->arg4 = $arg4;
return $this;
}

/**
* Set arg5 value
* @param string $arg5
* @return \StructType\GetDocumentIdsList
*/
public function setArg5($arg5 = null)
{
// validation for constraint: string
if (!is_null($arg5) && !is_string($arg5)) {
throw new \InvalidArgumentException(sprintf('Invalid value %s, please provide a string, %s given', var_export($arg5, true), gettype($arg5)), LINE);
}
$this->arg5 = $arg5;
return $this;
}

Thank you and excuse for my bad english

[mikaelcom]

Have you dumped the XMLRequest sent? What does it contain?