auto str1 = chrono::to_string(make_timestamp());
std::cout << str1 << std::endl;

auto to_utc = [](std::string_view str) {
    return caf::chrono::datetime::from_string(str).and_then([](auto&& dt) {
      auto cpy = dt;
      cpy.force_utc();
      return expected<std::string>{to_string(cpy)};
    });
  };

auto str = chrono::to_string(std::chrono::system_clock::now()); 
std::cout<<*to_utc(str)<<std::endl;