[Bug libstdc++/120810] [DR 461] std::time_get::do_get_date should consider date_order()

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120810

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Frankly, std::time_get::do_date_order() seems unusable and should be
deprecated.