date:gnu coreutils compatibility (date ethiopia.sh)

[mattsu2020]

To ensure compatibility with GNU coreutils, we will make modifications so that the tests pass.

date-ethiopia.sh

[sylvestre]

why do we need a new complex file for that? thanks

[sylvestre]

Sorry, it was a general statement to say that i am not a fan of the added complexity of this pr
it feels to complex (not mentioning the long list of if / else)

[mattsu2020]

Sorry, it was a general statement to say that i am not a fan of the added complexity of this pr it feels to complex (not mentioning the long list of if / else)

We will split the PR.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/date/resolution. tests/date/resolution is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/tty/tty-eof. tests/tty/tty-eof is passing on 'main'. Maybe you have to rebase?
Congrats! The gnu test tests/date/date-ethiopia is no longer failing!