25 Time library [time]

25.8 The civil calendar [time.cal]

25.8.3 Class day [time.cal.day]

25.8.3.3 Non-member functions [time.cal.day.nonmembers]

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constexpr bool operator==(const day& x, const day& y) noexcept;
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Returns: unsigned{x} == unsigned{y}.
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constexpr bool operator<(const day& x, const day& y) noexcept;
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Returns: unsigned{x} < unsigned{y}.
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constexpr day operator+(const day& x, const days& y) noexcept;
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Returns: day(unsigned{x} + y.count()).
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constexpr day operator+(const days& x, const day& y) noexcept;
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Returns: y + x.
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constexpr day operator-(const day& x, const days& y) noexcept;
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Returns: x + -y.
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constexpr days operator-(const day& x, const day& y) noexcept;
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Returns: days{int(unsigned{x}) - int(unsigned{y}).
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template<class charT, class traits> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& os, const day& d);
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Effects: Inserts format(fmt, d) where fmt is "%d" widened to charT.
If !d.ok(), appends with " is not a valid day".
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Returns: os.
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template<class charT, class traits> basic_ostream<charT, traits>& to_stream(basic_ostream<charT, traits>& os, const charT* fmt, const day& d);
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Effects: Streams d 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, day& d, basic_string<charT, traits, Alloc>* abbrev = nullptr, minutes* offset = nullptr);
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Effects: Attempts to parse the input stream is into the day d using the format flags given in the NTCTS fmt as specified in [time.parse].
If the parse fails to decode a valid day, is.setstate(ios_­base​::​failbit) shall be called and d 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.
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constexpr day operator""d(unsigned long long d) noexcept;
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Returns: day{static_­cast<unsigned>(d)}.