namespace std::chrono {
class year {
short y_; // *exposition only*
public:
year() = default;
constexpr explicit year(int y) noexcept;
constexpr year& operator++() noexcept;
constexpr year operator++(int) noexcept;
constexpr year& operator--() noexcept;
constexpr year operator--(int) noexcept;
constexpr year& operator+=(const years& y) noexcept;
constexpr year& operator-=(const years& y) noexcept;
constexpr year operator+() const noexcept;
constexpr year operator-() const noexcept;
constexpr bool is_leap() const noexcept;
constexpr explicit operator int() const noexcept;
constexpr bool ok() const noexcept;
static constexpr year min() noexcept;
static constexpr year max() noexcept;
};
}

year represents a year in the civil calendar.

It can represent values in the range [min(), max()].

It can be constructed with any int value,
which will be subsequently truncated to fit into year's unspecified internal storage.

year meets the *Cpp17EqualityComparable* (Table 28)
and *Cpp17LessThanComparable* (Table 29) requirements,
and participates in basic arithmetic with years objects,
which represent a difference between two year objects.