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std::chrono::month_day_last::ok

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

Checks if the month object stored in *this is valid.

Return value

month().ok().

Example 

#include <iostream>
#include <chrono>
 
int main()
{
    std::cout << std::boolalpha;
 
    auto mdl {std::chrono::February/std::chrono::last};
    std::cout << (mdl.ok()) << ' ';
    mdl = {std::chrono::month(42)/std::chrono::last};
    std::cout << (mdl.ok()) << '\n';
}

Output:

true false

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