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std::chrono::day::ok(3)	      C++ Standard Libary      std::chrono::day::ok(3)

NAME
       std::chrono::day::ok - std::chrono::day::ok

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

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

Return value
	  true	if the day value stored	in *this is in the range [1, 31]. Oth-
       erwise false.

Example
       // Run this code

	#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() {}

See also
	  operator unsigned retrieves the stored day value
			    (public member function)

http://cppreference.com		  2024.06.10	       std::chrono::day::ok(3)

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