Break std::strftime using a Japanese CP932 locale on Windows

strftime_ja.cpp

#include <ctime>
#include <iostream>
#include <locale>

int main() {
  std::locale::global(std::locale("Japanese_Japan.932"));
  std::time_t t = std::time(nullptr);
  char mbstr[20000];
  if (std::strftime(mbstr, sizeof (mbstr), "%Y年%m月%d日 %H:%M:%S", std::localtime(&t))) {
    std::cout << mbstr << '\n';
  }
}