c++ 标准库格式化时间戳(既将时间戳转字符串，字符串转时间戳）

//时间戳转字符串
std::string Time_t2String(__time64_t stamp) { 
   tm* stamp_tm = localtime(&stamp);
  std::ostringstream os;
  os << std::put_time(stamp_tm, "%Y:%m:%d %H:%M:%S");
  return os.str();
}
std::wstring Time_t2WString(__time64_t stamp) {
  tm* stamp_tm = localtime(&stamp);
  std::wostringstream os;
  os << std::put_time(stamp_tm, L"%Y:%m:%d %H:%M:%S");
  return os.str();
}
//字符串转时间戳
__time64_t String2Time_t(std::string time_string) {
  std::istringstream is(time_string);
  tm time_tm = {};
  is >> std::get_time(&time_tm, "%Y:%m:%d %H:%M:%S");

  return mktime(&time_tm);
}
__time64_t WString2Time_t(std::wstring time_string) {
  std::wistringstream is(time_string);
  tm time_tm = {};
  is >> std::get_time(&time_tm, L"%Y:%m:%d %H:%M:%S");

  return mktime(&time_tm);
}

//测试

int main() {
  __time64_t cur_time_stamp = std::chrono::system_clock::to_time_t(
      std::chrono::system_clock::now());
  std::string time_str = Time_t2String(cur_time_stamp);
  std::cout << time_str << std::endl;
std::cout << String2Time_t(time_str) << std::endl;
}