27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.3 Class day [time.cal.day]

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

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

Returns: unsigned{x} == unsigned{y}.

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

Returns: unsigned{x} <=> unsigned{y}.

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constexpr day operator+(const day& x, const days& y) noexcept;

Returns: day(unsigned{x} + y.count()).

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constexpr day operator+(const days& x, const day& y) noexcept;

Returns: y + x.

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constexpr day operator-(const day& x, const days& y) noexcept;

Returns: x + -y.

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constexpr days operator-(const day& x, const day& y) noexcept;

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);

Effects: Equivalent to: return os << (d.ok() ? format(STATICALLY-WIDEN<charT>("{:%d}"), d) : format(STATICALLY-WIDEN<charT>("{:%d} is not a valid day"), d));

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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);

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) is called and d 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.

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constexpr chrono::day operator""d(unsigned long long d) noexcept;

Returns: day{static_cast<unsigned>(d)}.