std::chrono::year_month_day_last::ok

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C-style date and time
std::chrono::year_month_day_last
constexpr bool ok( ) const noexcept ;
(since C++20)

Checks if *this represents a valid date. Because a year_month_day_last

Return value

year( ).ok ( ) && month( ).ok ( )

Example

Run this code
#include <cassert>
#include <chrono>
 
int main()
{
    auto ymdl{std::chrono::last/11/2020};
    assert(ymdl.ok());
    ymdl = std::chrono::year(2020)/std::chrono::month(13)/std::chrono::last;
    assert(not ymdl.ok());
}
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