25 Time library [time]

25.8 The civil calendar [time.cal]

25.8.9 Class month_­day [time.cal.md]

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

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constexpr bool operator==(const month_day& x, const month_day& y) noexcept;
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Returns: x.month() == y.month() && x.day() == y.day().
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constexpr bool operator<(const month_day& x, const month_day& y) noexcept;
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Returns: If x.month() < y.month() returns true.
Otherwise, if x.month() > y.month() returns false.
Otherwise, returns 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);
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Returns: os << md.month() << '/' << md.day().
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template<class charT, class traits> basic_ostream<charT, traits>& to_stream(basic_ostream<charT, traits>& os, const charT* fmt, const month_day& md);
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Effects: Streams md into os using the format specified by the NTCTS fmt.
fmt encoding follows the rules specified in [time.format].
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Returns: os.
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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);
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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) shall be called and md shall not be 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.
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Returns: is.