date: does not respect width/padding character in output format string

Steps to reproduce:

date -d "1999-12-08" +%03d

What happens now: uutils date terminates with an error message:

date: invalid format %03d

What I expected to happen: GNU date prints the day number with a width of three padded by zeros:

Notes: this is causing a failure in GNU test file tests/date/date.pl. This is not specific to %d:

$ date -d "1999-12-08" +%05y
00099
$ date -d "1999-12-08" +%05a
00Wed

Seams that the format strings are processed by chrono so it might seam to have to be fixed there.

Opened an issue: #1663

The first two examples have been fixed in the meantime, though the first example returns an incorrect value (see #8427):

$ cargo run -q date -d "1999-12-08" +%03d
007
$ cargo run -q date -d "1999-12-08" +%05y
00099

The third example still doesn't have padding (plus the value is incorrect, probably related to #8427), so I will keep this issue open.

$ cargo run -q date -d "1999-12-08" +%05a
Tue

The value is now correct, but still no padding:

$ cargo run -q date -d "1999-12-08" +%05a
Wed

This issue was fixed a while ago in the migration to Jiff all of the test cases in the comments here are working as expected

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