title: Can't pickle <class 'pywintypes.datetime'>: attribute lookup datetime on pywintypes failed
body: <p>I am using python 3.5 (32bit), win10-64bit, OpenOPC, and I have downloaded pywin32 build 64bit. I have run the following python code:</p>
  
  <pre><code>import OpenOPC
  import time
  opc=OpenOPC.client()
  
  opc.connect('Matrikon.OPC.Simulation.1')
  
  tags =['Random.Int4','Random.Real4']
  
  while True:
  
     try:
  
         value = opc.read(tags,group='Group0',update=1)
  
         print (value)
  
     except OpenOPC.TimeoutError:
  
         print ("TimeoutError occured")
  
  
     time.sleep(5)
  </code></pre>
  
  <p>but I always get this error message:</p>
  
  <blockquote>
    <p>Traceback (most recent call last):   File "C:\Program Files
    (x86)\Python35-32\lib\multiprocessing\queues.py", line 241, in _feed
        obj = ForkingPickler.dumps(obj)   File "C:\Program Files (x86)\Python35-32\lib\multiprocessing\reduction.py", line 50, in dumps
        cls(buf, protocol).dump(obj)
    _pickle.PicklingError: Can't pickle : attribute lookup datetime on pywintypes failed.</p>
  </blockquote>