30 Time library [time]

30.8 The civil calendar [time.cal]

30.8.9 Class month_day [time.cal.md]

30.8.9.3 Non-member functions [time.cal.md.nonmembers]

constexpr bool operator==(const month_day& x, const month_day& y) noexcept;

Returns: x.month() == y.month() && x.day() == y.day().

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constexpr strong_ordering operator<=>(const month_day& x, const month_day& y) noexcept;

Effects: Equivalent to: if (auto c = x.month() <=> y.month(); c != 0) return c; return x.day() <=> y.day();

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template<class charT, class traits>
  basic_ostream<charT, traits>&
    operator<<(basic_ostream<charT, traits>& os, const month_day& md);

Effects: Equivalent to: return os << format(os.getloc(), STATICALLY-WIDEN<charT>("{:L}/{}"), md.month(), md.day());

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template<class charT, class traits, class Alloc = allocator<charT>>
  basic_istream<charT, traits>&
    from_stream(basic_istream<charT, traits>& is, const charT* fmt,
                month_day& md, basic_string<charT, traits, Alloc>* abbrev = nullptr,
                minutes* offset = nullptr);

Effects: Attempts to parse the input stream is into the month_day md using the format flags given in the NTCTS fmt as specified in [time.parse].

If the parse fails to decode a valid month_day, is.setstate(ios_base::failbit) is called and md is not modified.

If %Z is used and successfully parsed, that value will be assigned to *abbrev if abbrev is non-null.

If %z (or a modified variant) is used and successfully parsed, that value will be assigned to *offset if offset is non-null.

Returns: is.