সি++ weekday

#include <iostream>
#include <chrono>
int main() {

  auto date =
    std::chrono::year_month_day{
      std::chrono::year(2026),
      std::chrono::month(8),
      std::chrono::day(31)
    };

  auto week =
    std::chrono::weekday{
      std::chrono::sys_days(date)
    };

  std::cout << week.c_encoding();

  return 0;
}