[Bug libstdc++/101152] std::get_time %Y accepts years with less than 4 digits

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101152

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It's not essential, but I think that would be helpful