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

NAME
       std::chrono::month::ok -	std::chrono::month::ok

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

	  Checks  if  the  month  value	stored in *this	is in the valid	range,
       i.e., [1, 12].

Return value
	  true if the month value stored in *this is in	 the  range  [1,  12].
       Otherwise false.

Example
       // Run this code

	#include <iostream>
	#include <chrono>

	int main()
	{
	    for	(const unsigned	mm : {6u, 0u, 16U}) {
		std::cout << mm	<< ": ";
		const std::chrono::month m{mm};
		m.ok() ? std::cout << "month is	valid\n"
		       : std::cout << "month is	invalid\n";
	    }
	}

Output:
	6: month is valid
	0: month is invalid
	16: month is invalid

http://cppreference.com		  2022.07.31	     std::chrono::month::ok(3)

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