code: def writeICCdatetime(t=None):
      
  
      import time
      if t is None:
          t = time.gmtime()
      return struct.pack('>6H', *t[:6])
docs: `t` should be a gmtime tuple (as returned from
      ``time.gmtime()``).  If not supplied, the current time will be used.
      Return an ICC dateTimeNumber in a 12 byte string.