std::chrono::year::max

static constexpr year max() noexcept;

(с C++20)

Возвращает наибольшее возможное year, то есть std::chrono::year(32767).

#include <chrono>
#include <iostream>
 
int main()
{
    std::cout << "The maximum year is: " << (int)std::chrono::year::max() << '\n';
}

Вывод:

The maximum year is: 32767

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