timestampTzParser :: A.Parser (Day, TimeOfDay, Tz)
timestampTzParser = do
  (date, time) <- timestampNoTzParser
  tz <- tzParser
  pure (date, time, tz)
timestampTzParser :: A.Parser (Day, TimeOfDay, Tz)
timestampTzParser = do
  (date, time) <- timestampNoTzParser
  tz <- tzParser
  pure (date, time, tz)
timestampTzParser = do
  (date, time) <- timestampNoTzParser
  tz <- tzParser
  pure (date, time, tz)