Function PyTZInfo_utcoffset_hhmm

python/pyarrow/src/arrow/python/datetime.cc:334–367

}

Result<std::string> PyTZInfo_utcoffset_hhmm(PyObject* pytzinfo) {
  // attempt to convert timezone offset objects to "+/-{hh}:{mm}" format
  OwnedRef pydelta_object(PyObject_CallMethod(pytzinfo, "utcoffset", "O", Py_None));
  RETURN_IF_PYERROR();

  if (!PyDelta_Check(pydelta_object.obj())) {
    return Status::Invalid(
        "Object returned by tzinfo.utcoffset(None) is not an instance of "
        "datetime.timedelta");
  }
  auto pydelta = reinterpret_cast<PyDateTime_Delta*>(pydelta_object.obj());

  // retrieve the offset as seconds
  auto total_seconds = internal::PyDelta_to_s(pydelta);

  // determine whether the offset is positive or negative
  auto sign = (total_seconds < 0) ? "-" : "+";
  total_seconds = abs(total_seconds);

  // calculate offset components
  int64_t hours, minutes, seconds;
  seconds = split_time(total_seconds, 60, &minutes);
  minutes = split_time(minutes, 60, &hours);
  if (seconds > 0) {
    // check there are no remaining seconds
    return Status::Invalid("Offset must represent whole number of minutes");
  }

  // construct the timezone string
  std::stringstream stream;
  stream << sign << std::setfill('0') << std::setw(2) << hours << ":" << std::setfill('0')
         << std::setw(2) << minutes;
  return stream.str();
}

// Converted from python.  See https://github.com/apache/arrow/pull/7604
// for details.