[tz] Wrong timezone Information provided

[Guy Harris]

On Oct 5, 2022, at 11:11 PM, Markus Torshizi Moghaddam via tz <tz at iana.org> wrote:

> some weeks ago the timezone data for Europe/Luxembourg changed on your side and a “Link Europe/Brussels Europe/Luxembourg” was added to https://data.iana.org/time-zones/tzdb/europe. This is wrong and results in the wrong timezone for Luxembourg and the wrong calculated time within Outlook and other applications.

Is this all on Windows, or are there any UN*X systems - Linux, macOS, etc. - involved?  I don't know whether anything in Windows, or any software from Microsoft that runs on Windows, uses the tzdb; there might be non-Microsoft software for Windows that does.

For software that *does* use the tzdb, in tzdb-2022a, the information for Europe/Luxembourg was

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone Europe/Luxembourg	0:24:36 -	LMT	1904 Jun
			1:00	Lux	CE%sT	1918 Nov 25
			0:00	Lux	WE%sT	1929 Oct  6  2:00s
			0:00	Belgium	WE%sT	1940 May 14  3:00
			1:00	C-Eur	WE%sT	1944 Sep 18  3:00
			1:00	Belgium	CE%sT	1977
			1:00	EU	CE%sT

and in tzdb-2022b, Europe/Luxembourg is a link to Europe/Brussels, and the Zone information for Europe/Brussels is

# Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
Zone	Europe/Brussels	0:17:30 -	LMT	1880
			0:17:30	-	BMT	1892 May  1 00:17:30
			0:00	-	WET	1914 Nov  8
			1:00	-	CET	1916 May  1  0:00
			1:00	C-Eur	CE%sT	1918 Nov 11 11:00u
			0:00	Belgium	WE%sT	1940 May 20  2:00s
			1:00	C-Eur	CE%sT	1944 Sep  3
			1:00	Belgium	CE%sT	1977
			1:00	EU	CE%sT

The last two entries are identical; as of 1944-09-18, those are the entries in effect for both tzdb regions, so, unless the applications you are referring to are dealing with dates prior to 1944-09-18, there should be no difference whatsoever due to the tzdb change.