text: from datetime import datetime
  from pytz import utc
  
  
  gagarin = datetime(1961, 4, 12, 14, 7)      # timezone naive
  
  in_utc = utc.localize(gagarin, is_dst=None)
  # datetime.datetime(1961, 4, 12, 14, 7, tzinfo=<UTC>)
  
  print(f'{in_utc:%Y-%m-%d %H:%M:%S %z}')
  # 1961-04-12 14:07:00 +0000
  