public void setCreationDate(java.util.Date creationDate) {
        this.creationDate = creationDate;
    }
<p>
The date when this type was registered.
</p>

@param creationDate
       The date when this type was registered.
aws-java-sdk-simpleworkflow/src/main/java/com/amazonaws/services/simpleworkflow/model/WorkflowTypeInfo.java