27 Time library [time]

27.8 The civil calendar [time.cal]

27.8.5 Class year [time.cal.year]

27.8.5.3 Non-member functions [time.cal.year.nonmembers]

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constexpr bool operator==(const year& x, const year& y) noexcept;
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Returns: int{x} == int{y}.
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constexpr strong_ordering operator<=>(const year& x, const year& y) noexcept;
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Returns: int{x} <=> int{y}.
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constexpr year operator+(const year& x, const years& y) noexcept;
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Returns: year{int{x} + y.count()}.
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constexpr year operator+(const years& x, const year& y) noexcept;
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Returns: y + x.
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constexpr year operator-(const year& x, const years& y) noexcept;
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Returns: x + -y.
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constexpr years operator-(const year& x, const year& y) noexcept;
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Returns: years{int{x} - int{y}}.
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template<class charT, class traits> basic_ostream<charT, traits>& operator<<(basic_ostream<charT, traits>& os, const year& y);
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Effects: Equivalent to: 
return os << (y.ok() ?
  format(STATICALLY-WIDEN<charT>("{:%Y}"), y) :
  format(STATICALLY-WIDEN<charT>("{:%Y} is not a valid year"), y));
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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, year& y, basic_string<charT, traits, Alloc>* abbrev = nullptr, minutes* offset = nullptr);
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Effects: Attempts to parse the input stream is into the year y using the format flags given in the NTCTS fmt as specified in [time.parse].
If the parse fails to decode a valid year, is.setstate(ios_­base​::​failbit) is called and y 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.
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Returns: is.
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constexpr chrono::year operator""y(unsigned long long y) noexcept;
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Returns: year{static_­cast<int>(y)}.