bug#63349: Bug in date when using UTC/GMT timeszones in the TZ variable

[Eiríkur Hjartarson]

Hi,

I'm on Fedora-38 GNU/Linux and the version string of 'date' is "date 
(GNU coreutils) 9.1".

$ ls -l /etc/localtime
lrwxrwxrwx. 1 root root 40 jan 11  2022 /etc/localtime -> 
../usr/share/zoneinfo/Atlantic/Reykjavik

Now the "bug":

$ TZ=Europe/Riga date --iso-8601=minutes -d "2024-01-01T00:00-05:00"
2024-01-01T07:00+02:00

$ TZ=UTC+2 date --iso-8601=minutes -d "2024-01-01T00:00-05:00"
2023-01-01T03:00-02:00

That is: the first command gives me the time and date in Riga when it's
midnight at new year's eve in New York.

The second command should do the same but instead gives the time in 
Godthab Greenland.

$ TZ=America/Godthab date -d "2024-01-01T00:00-05:00" --iso-8601=minutes
2024-01-01T03:00-02:00

It seems to me that the sign in the timezone variable could be simply 
reversed.

Regards,
--
Eiríkur