bug#79261: coreutils 9.7 "date -u" - timezone offset is in the wrong direction

On Sun, Aug 17, 2025, at 10:02, James Feeney via GNU coreutils Bug Reports wrote:
> Arch Linux
> coreutils 9.7-1
>
> $ timedatectl;date;date -u
>                Local time: Sun 2025-08-17 09:50:24 MDT
>            Universal time: Sun 2025-08-17 15:50:24 UTC
>                  RTC time: Sun 2025-08-17 15:50:24
>                 Time zone: US/Mountain (MDT, -0600)
> System clock synchronized: yes
>               NTP service: active
>           RTC in local TZ: no
> Sun Aug 17 09:50:24 AM MDT 2025
> Sun Aug 17 03:50:24 PM UTC 2025
>
> `timedatectl` is correct.
> `date` is correct.
> `date -u` is off by 2x the timezone offset, showing UTC as 6 hours 
> earlier, which is wrong, instead of 6 hours later, which is correct.
>

UTC = 09:50:24 MDT + 6hr = 15:50:24 = 03:50:24 PM, which is what date -u shows.