# std::literals::chrono_literals::operator""y

From cppreference.com
< cpp‎ | chrono

Defined in header `<chrono>` |  |
constexpr std::chrono::year operator""y( unsigned long long y ) noexcept; |  | (since C++20)

Forms a std::chrono::year literal representing a year in the proleptic Gregorian calendar.

### Parameters

y | - | the year value

### Return value

A std::chrono::year initialized from int(y). If y is not in the range `[`-32767`,` 32767`]`, the stored value is unspecified.

### Possible implementation

    constexpr std::chrono::year operator""y(unsigned long long y) noexcept
    {
        return std::chrono::year(static_cast<int>(y));
    }

### Notes

This operator is declared in the namespace std::literals::chrono_literals, where both literals and chrono_literals are inline namespaces. Access to this operator can be gained with:

- using namespace std::literals,
- using namespace std::chrono_literals, or
- using namespace std::literals::chrono_literals.

In addition, within the namespace std::chrono, the directive using namespace literals::chrono_literals; is provided by the standard library, so that if a programmer uses using namespace std::chrono; to gain access to the classes in the chrono library, the corresponding literal operators become visible as well.

### Example

Run this code

    #include <chrono>
    #include <iostream>

    int main()
    {
        using namespace std::literals;

        std::cout << int(2020y)  << '\t' << 2020y  << '\n'
                  << int(-220y)  << '\t' << -220y  << '\n'
                  << int(3000y)  << '\t' << 3000y  << '\n'
                  << int(32768y) << '\t' << 32768y << '\n'  // unspecified
                  << int(65578y) << '\t' << 65578y << '\n'; // unspecified
    }

Possible output:

    2020	2020
    -220	-0220
    3000	3000
    -32768	-32768 is not a valid year
    42	0042

### See also

(constructor) | constructs a `year` (public member function of `std::chrono::year`)

Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/chrono/operator%22%22y&oldid=157660"