Midnight showing up different between machines set to UTC

I have the following function:

function formatTime(ms) {
  const dateTime = DateTime.fromMillis(ms)
  return dateTime.toLocaleString( DateTime.TIME_24_WITH_SHORT_OFFSET)
}

When I pass in 0 I see 00:00:00 UTC on my local machine. However, I see 24:00:00 UTC on my CI server.

I’ve configured my test suite to force a timezone of UTC, but one represents the midnight hour as 00 and the other as 24. Is there a way to force one or the other?

[koitsu]

It’s almost certainly the locale. Try forcing the locale to the same thing, like setLocale("en-us")

It isn’t the locale. There is a deeper bug with TZ support when it comes to negative TZ offsets. Please see #733 for an example.

[GillesDebunne]

I’m closing this bug as a duplicate of #726. Please post your comments there.