bug(date): -s option rejects military times that end with j

[HackingRepo]

Hi, uutils mainteners

the -s set date option, rejects miliatry times that end with j as we confirmed

relunsec@relunsec:~/software/coreutils/target/debug$ ./date -s "J" 
date: invalid date 'J'
relunsec@relunsec:~/software/coreutils/target/debug$ gnudate -s "J" 
gnudate: cannot set date: Operation not permitted
Mon Jun 15 12:00:00 AM EDT 2026
relunsec@relunsec:~/software/coreutils/target/debug$ ./date -s "3j" 
date: invalid date '3j'
relunsec@relunsec:~/software/coreutils/target/debug$ gnudate -s "3j" 
gnudate: cannot set date: Operation not permitted
Mon Jun 15 03:00:00 AM EDT 2026
relunsec@relunsec:~/software/coreutils/target/debug$ 

it needs be fixed too