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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/114240] sys_days not being parsed with only a date in
 the stream
Date: Tue, 05 Mar 2024 15:25:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114240

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think the problem is that I just have some generic logic that assumes all
sys_time specializations are a date time, and so require both a date and a
time. But obviously for sys_days we only need a date.

  template<typename _CharT, typename _Traits, typename _Duration,
           typename _Alloc =3D allocator<_CharT>>
    basic_istream<_CharT, _Traits>&
    from_stream(basic_istream<_CharT, _Traits>& __is, const _CharT* __fmt,
                sys_time<_Duration>& __tp,
                basic_string<_CharT, _Traits, _Alloc>* __abbrev =3D nullptr,
                minutes* __offset =3D nullptr)
    {
      minutes __off{};
      if (!__offset)
        __offset =3D &__off;
      using __format::_ChronoParts;
      auto __need =3D _ChronoParts::_Year | _ChronoParts::_Month
                    | _ChronoParts::_Day | _ChronoParts::_TimeOfDay;

This should depend on _Duration::period.=