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Showing content from https://en.cppreference.com/w/cpp/algorithm/../algorithm/../../cpp/chrono/day/ok.html below:

std::chrono::day::ok - cppreference.com

constexpr bool ok() const noexcept;

Checks if the day value stored in *this is in the valid range, i.e., [1, 31].

true if the day value stored in *this is in the range [1, 31]. Otherwise false.

#include <chrono>
using namespace std::chrono_literals;
 
constexpr std::chrono::day d0{00};
constexpr std::chrono::day d1{13};
constexpr std::chrono::day d2{42};
 
static_assert
(
    d0 == 0d && !d0.ok() &&
    d1 == 13d && d1.ok() &&
    d2 == 42d && !d2.ok()
);
 
int main() {}

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