In Decisions 4.1 there is a change to use of DateTime fields as follows:
Returning a Date Only value will not validate against an xsd:dateTime (same for Time Only sub-type, also). What this means is that for backward compatibility, a DateTime data type without a sub-type is equivalent to the earlier Date data-type in pre-4.1 versions of Decisions. However, the response message may not validate against the XSD/WSDL. It is our recommendation that after upgrading to Decisions 4.1, the integrator specifies explicitly all the DateTime subtypes. Only then is the response message guaranteed to validate against the XSD/WSDL.
 

In Decisions 4.1 there is a change to use of DateTime fields. Must the WSDLs be recreated for an upgrade to 4.1?

o TIBCO iProcess Decisions Server 4.1.x o TIBCO iProcess Decisions Studio 4.1.x o All Platforms

If all the data types for your attribute are of type 'DateTime' and granted that the client also has 'xsd:dateTime' for the same attribute in the WSDL file you do not need to change your WSDL or regenerate the vocabulary.

For example in the WSDL

      <xsd:complexType name="ActivityType">
        <xsd:sequence>
          <xsd:element name="asr" type="xsd:string" nillable="false" minOccurs="0" />
          <xsd:element name="detail_type" type="xsd:string" nillable="false" minOccurs="0" />
          <xsd:element name="end_date" type="xsd:date" nillable="false" minOccurs="0" />
          <xsd:element name="ruleset_code" type="xsd:string" nillable="false" minOccurs="0" />
          <xsd:element name="start_date" type="xsd:dateTime" nillable="false" minOccurs="0" />
          <xsd:element name="waste_code_list" type="tns:ExtURIType" minOccurs="0" />
        </xsd:sequence>

You need to only worry if you start using the sub-types: 'Date Only' and 'Time Only'.  The Subtype 'Full DateTime' is the same as xsd:dateTime which is the same as if you didn’t select a subtype in 4.x.  If you do select one of the other sub-types then you should regenerate or create a new WSDL using the 'Deployment Console'.  The new WSDL will then have the following entries for 'Date only' and 'Time Only' respectively: 'xsd:date' and 'xsd:time'