std::chrono::month_day::ok

From cppreference.com
< cpp‎ | chrono‎ | month day
 
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chrono I/O
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C-style date and time
 
std::chrono::month_day
 
constexpr bool ok() const noexcept;
 (since 哋它亢++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(). The number of days in February is considered to be 29.

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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