# std::chrono::year_month_weekday::ok

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< cpp‎ | chrono‎ | year month weekday

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

Checks if this `year_month_weekday` object represents a valid date.

### Return value

true if this `year_month_weekday` object represents a valid date, that is, year().ok() && month().ok() && weekday_indexed().ok() is true and there are at least index() weekday()s in the specified year and month. Otherwise false.

### Example

Run this code

    #include <iostream>
    #include <chrono>

    int main()
    {
        std::cout << std::boolalpha;

        auto ymwdi {std::chrono::Wednesday[1]/1/2021};
        std::cout << (ymwdi.ok()) << ' ';
        ymwdi = std::chrono::year(2021)/std::chrono::month(1)/
                std::chrono::Wednesday[42];
        std::cout << (ymwdi.ok()) << '\n';
    }

Output:

    true false

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