code: def populate_times(self):
          
          stop_time = self.meta_data.get("stop_time")
          if stop_time:
              stop_naive = datetime.utcfromtimestamp(stop_time)
              self.stop_time = stop_naive.replace(tzinfo=tzutc())
  
          creation_time = self.meta_data.get("creation_time")
          if creation_time:
              creation_naive = datetime.utcfromtimestamp(creation_time)
              self.creation_time = creation_naive.replace(tzinfo=tzutc())
  
          start_time = self.meta_data.get("start_time")
          if start_time:
              start_naive = datetime.utcfromtimestamp(start_time)
              self.start_time = start_naive.replace(tzinfo=tzutc())
docs: Populates all different meta data times that comes with measurement if
          they are present.