code: def getByTime(self, startTime=None, endTime=None):
          
          collections = self.get_data_collections()
  
          if startTime is not None:
              startTime = float(startTime)
          if endTime is not None:
              endTime = float(endTime)
  
          if startTime is not None and endTime is not None:
              timeQuery = {"$and": [{"timestamps": {"$gt": startTime}},
                                    {"timestamps": {"$lt": endTime}}]}
          elif startTime is not None and endTime is None:
              timeQuery = {"timestamps": {"$gt": startTime}}
          elif startTime is None and endTime is not None:
              timeQuery = {"timestamps": {"$lt": endTime}}
  
          IDs = []
  
          for coll in collections:
              docs = self.noteDB[coll].find(timeQuery, {"ID": 1, "_id": 0})
              for doc in docs:
                  IDs.append(doc['ID'])
  
          return IDs
docs: :desc: Get all the notes in the given time window
              :param int startTime: The begining of the window
              :param int endTime: The end of the window
              :returns: A list of IDs
              :ravl: list