#include <chrono>
#include <cstdlib>
#include <iostream>
#include <fmt/core.h>
#include <fmt/chrono.h>

int main()
{
    const auto& timeZoneDatabase = std::chrono::get_tzdb();
    const auto& currentZone = timeZoneDatabase.current_zone();
    std::cout << currentZone->name() << '\n'; // This needs to be Australia/Sydney

    uint64_t two_in_the_morning = 1743865205; // just after 2am on 2025/4/6 which is a daylight savings changeover point
    auto dur = std::chrono::duration<uint64_t>(two_in_the_morning);
    auto time_point = std::chrono::time_point<std::chrono::system_clock, std::chrono::duration<uint64_t>>(dur);
    auto time_point_as_local_seconds = currentZone->to_local(std::chrono::floor<std::chrono::seconds>(time_point));

    std::string text = fmt::format("{:%Y-%m-%d %H:%M:%S}", time_point_as_local_seconds);
    std::cout << text << '\n';
    return 0;
}