# std::chrono::year::ok

From cppreference.com
< cpp‎ | chrono‎ | year

constexpr bool ok() const noexcept; |  | (since C++20)

Checks if the year value stored in *this is in the valid range, i.e., [-32767, 32767].

### Return value

true if the year value stored in *this is in the range [-32767, 32767]. Otherwise false.

### Possible implementation

See the implementations in libstdc++, libc++, and Howard Hinnant's date.h.

    class Year
    {
        short year_;   // exposition-only

    public:

        bool ok() const noexcept { return year_ != std::numeric_limits<short>::min(); }

        /*...*/
    };

### Example

Run this code

    #include <iostream>
    #include <iomanip>
    #include <chrono>

    int main()
    {
        for (const int i : {2020, 0x8000, 0x8001, 0xFFFF, 0x18000}) {
            const std::chrono::year y{i};
            std::cout << std::boolalpha
                << "input year: " << std::setw(6) << i
                << " │ internal value: " << std::setw(7) << static_cast<int>(y)
                << " │ ok(): " << y.ok() << '\n';
        }
    }

Possible output:

    input year:   2020 │ internal value:    2020 │ ok(): true
    input year:  32768 │ internal value:  -32768 │ ok(): false
    input year:  32769 │ internal value:  -32767 │ ok(): true
    input year:  65535 │ internal value:      -1 │ ok(): true
    input year:  98304 │ internal value:  -32768 │ ok(): false

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