std::chrono::month_day::ok

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< cpp‎ | chrono‎ | month day
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C-style date and time
std::chrono::month_day
constexpr bool ok( ) const noexcept ;
(since C++20)

Determines whether this month_day stores a valid month-day combination.

The combination is valid if month() represents a valid month ( month().ok() == true ), unsigned{day()} >= 1 , and unsigned{day()} <= D , where D is the number of days in the month represented by month()

Return value

true if the month and day combination is valid, otherwise false.

Example

Run this code
#include <chrono>
#include <iostream>
 
int main()
{
    std::cout << std::boolalpha;
 
    constexpr auto md1{std::chrono::July/15};
    std::cout << (md1.ok()) << ' ';
    constexpr std::chrono::month_day md2{std::chrono::month(14), std::chrono::day(42)};
    std::cout << (md2.ok()) << ' ';
    constexpr auto md3{std::chrono::February/29};
    std::cout << (md3.ok()) << '\n';
}

Output: 

true false true
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