docs: def from_datetime(cls, generation_time):
          """Create a dummy ObjectId instance with a specific generation time.
  
          This method is useful for doing range queries on a field
          containing :class:`ObjectId` instances.
  
          .. warning::
             It is not safe to insert a document containing an ObjectId
             generated using this method. This method deliberately
             eliminates the uniqueness guarantee that ObjectIds
             generally provide. ObjectIds generated with this method
             should be used exclusively in queries.
  
          `generation_time` will be converted to UTC. Naive datetime
          instances will be treated as though they already contain UTC.
  
          An example using this helper to get documents where ``"_id"``
          was generated before January 1, 2010 would be:
  
          >>> gen_time = datetime.datetime(2010, 1, 1)
          >>> dummy_id = ObjectId.from_datetime(gen_time)
          >>> result = collection.find({"_id": {"$lt": dummy_id}})
  
          :Parameters:
            - `generation_time`: :class:`~datetime.datetime` to be used
              as the generation time for the resulting ObjectId.
          """
          if generation_time.utcoffset() is not None:
              generation_time = generation_time - generation_time.utcoffset()
          timestamp = calendar.timegm(generation_time.timetuple())
          oid = struct.pack(
              ">i", int(timestamp)) + b"\x00\x00\x00\x00\x00\x00\x00\x00"
          return cls(oid)