code: def list_snapshots_hours(path, cam_id, day):
      
      screenshoots_path = path+"/"+str(cam_id)+"/"+day
      if os.path.exists(screenshoots_path):
          hours = []
          for hour_dir in sorted(os.listdir(screenshoots_path)):
              hrm = datetime.datetime.strptime(hour_dir, "%H%M").strftime('%H:%M')
              hours.append((hrm, hour_dir))
          return hours
      else:
          return []
docs: Returns a list of hour/min in which snapshopts are present