# std::chrono::year_month::ok

From cppreference.com
< cpp‎ | chrono‎ | year month

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

Checks if the year and month values stored in this object are valid.

### Return value

year().ok() && month().ok()

### Example

Run this code

    #include <iostream>
    #include <chrono>
    using namespace std::chrono_literals;

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

        constexpr std::chrono::year_month ym1 {3030y, std::chrono::July};
        std::cout << ym1.ok() << ' ';

        constexpr std::chrono::year_month ym2 {std::chrono::year(2020)/16};
        std::cout << ym2.ok() << '\n';
    }

Output:

    true false

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