Weird behavior of DateTime.diff with winter time change

Describe the bug DateTime.diff(..., 'days') returns a weird number of days when the two DateTime are before and after the winter time change. With a fixed time to 00:00:00Z on both dates, the diff in days returned is not an integer but slightly less (30.95833333 instead of 31 for example) What is strange is that asking for the diff in hours and dividing it by 24 returns the integer while I would have thought it would not.

Asking DateTime to parse the same dates as utc fixes the issue, FYI.

To Reproduce You can run it in this fiddle

const DateTime = luxon.DateTime;

// weird
const beforeTimeChange = DateTime.fromISO('2021-10-15T00:00:00Z', {zone: 'Europe/Andorra'});
const afterTimeChange = DateTime.fromISO('2021-11-15T00:00:00Z', {zone: 'Europe/Andorra'});
console.log(afterTimeChange.diff(beforeTimeChange, 'days').days); // => 30.958333333333332
console.log(afterTimeChange.diff(beforeTimeChange, 'hours').hours / 24); // => 31

// ok
const beforeTimeChangeOK = DateTime.fromISO('2021-10-15T00:00:00Z', {zone: 'utc'});
const afterTimeChangeOK = DateTime.fromISO('2021-11-15T00:00:00Z', {zone: 'utc'});
console.log(afterTimeChangeOK.diff(beforeTimeChangeOK, 'days').days); // => 31
console.log(afterTimeChangeOK.diff(beforeTimeChangeOK, 'hours').hours / 24); // => 31

Actual vs Expected behavior I would expect the diff in days to be an integer and maybe the diff in hours to be one hour less than one it is today.

Desktop (please complete the following information):

• OS: Ubuntu 18.04
• Browser: Brave 1.31.87
• Luxon version: 2.0.2
• Your timezone: not relevant

Additional context Not directly related to the bug and just giving thoughts but I would be nice to make it clear that the DateTime.diff method takes into account the timezone and is not done on utc. Maybe it would be clearer to have the DateTime.diff be in utc and have something like a DateTime.localDiff which makes the diff in the timezone.

[icambron]

Another solution is

afterTimeChange.diff(beforeTimeChange, "hours").as("days")

[vinassefranche]

Thanks @icambron I’ll try your solutions and see what works best for us!