std::chrono::year::operator+, std::chrono::year::operator-

< cpp‎ | chrono‎ | year
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constexpr std::chrono::year operator+() noexcept;
(1) (since C++20)
constexpr std::chrono::year operator-() noexcept;
(2) (since C++20)

Applies the unary operators to the year value.

1) Returns a copy of *this.
2) Returns a year whose year value is the negation of that of *this.

[edit] Return value

1) *this
2) std::chrono::year(-int(*this))

[edit] Example

#include <chrono>
#include <iostream>
int main()
    constexpr std::chrono::year y{2020};
    constexpr auto ny = -y;
    std::cout << "The year " << (int)y << " negated is " << (int)ny << '\n';


The year 2020 negated is -2020