//********************************************************
// The following code example is taken from the book
//  C++20 - The Complete Guide
//  by Nicolai M. Josuttis (www.josuttis.com)
//  http://www.cppstd20.com
//
// The code is licensed under a
//  Creative Commons Attribution 4.0 International License
//  http://creativecommons.org/licenses/by/4.0/
//********************************************************


#include <iostream>
#include <chrono>

int main()
{
  using namespace std::literals;
  namespace chr = std::chrono;
  
  auto tpUtc@ @=@ @chr::clock_cast<chr::utc_clock>(chr::sys_days{2017y/1/1}@ @-@ @1000ms);
  for (auto end = tpUtc + 2500ms; tpUtc <= end; tpUtc += 200ms) {
    auto tpSys = chr::clock_cast<chr::system_clock>(tpUtc);
    auto tpGps = chr::clock_cast<chr::gps_clock>(tpUtc);
    auto tpTai = chr::clock_cast<chr::tai_clock>(tpUtc);
    std::cout << std::format("{:%F %T} SYS  ", tpSys);
    std::cout << std::format("{:%F %T %Z}  ",  tpUtc);
    std::cout << std::format("{:%F %T %Z}  ",  tpGps);
    std::cout << std::format("{:%F %T %Z}\n",  tpTai);
  }
}