touch: -t YYMMDDhhmm leads to incorrect year if YY > 68 #7280
Description
If a two-digit year is specified with -t, GNU touch uses the 19-prefix if the year is greater than 68, whereas uutils touch uses 20.
$ touch -t 6801010000 a
$ ls -l a
-rw-r--r-- 1 dho dho 0 Jan 1 2068 a
$ touch -t 6901010000 a
$ ls -l a
-rw-r--r-- 1 dho dho 0 Jan 1 1969 a
$ cargo run -q touch -t 6801010000 a
$ ls -l a
-rw-r--r-- 1 dho dho 0 Jan 1 2068 a
$ cargo run -q touch -t 6901010000 a
$ ls -l a
-rw-r--r-- 1 dho dho 0 Jan 1 2069 a