std::chrono::year::year

year() = default;
(since C++20)
explicit constexpr year(int y) noexcept;
(since C++20)

Constructs a year object.

1) Default constructor leaves the year value uninitialized.
2) If y is in the range [-32767, 32767], constructs a year object holding the year value y. Otherwise the value held is unspecified.

© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/chrono/year/year