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std::string GetTime(const std::time_t &currentTime, int offset, const char *format_string) {
  char buffer[80];
  const auto *tm = std::localtime(&currentTime);
  std::strftime(buffer, sizeof(buffer), format_string, tm);
  return buffer;
}
int main(){
    time_t time_offset = time(nullptr);
    struct tm *now_ = localtime(&t);
    std::cout << GetTime(time_offset -  now.tm_wday * 24 * 60 * 60, 0,"%Y-%m-%d") << std::endl;
    std::cout << GetTime(time_offset -  now.tm_wday * 24 * 60 * 60, 0,"%Y-%m-%d") << std::endl;
    return 0;
}