Time Duration

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// timeSinceEpoch.cpp

#include <chrono>
#include <iostream>

int main(){

  std::cout << std::fixed << std::endl;
  
  std::cout << "Time since 1.1.1970:\n" << std::endl;

  auto timeNow= std::chrono::system_clock::now();
  auto duration= timeNow.time_since_epoch();
  std::cout << duration.count() << " nanoseconds " << std::endl;

  typedef std::chrono::duration<long double,std::ratio<1,1000000>> MyMicroSecondTick;
  MyMicroSecondTick micro(duration);
  std::cout << micro.count() << " microseconds" << std::endl;
  
  typedef std::chrono::duration<long double,std::ratio<1,1000>> MyMilliSecondTick;
  MyMilliSecondTick milli(duration);
  std::cout << milli.count() << " milliseconds" << std::endl;
  
  typedef std::chrono::duration<long double> MySecondTick;
  MySecondTick sec(duration);
  std::cout << sec.count() << " seconds " << std::endl;
  
  typedef std::chrono::duration<double, std::ratio<60>> MyMinuteTick;
  MyMinuteTick myMinute(duration);
  std::cout << myMinute.count() << " minutes" << std::endl;

  typedef std::chrono::duration<double, std::ratio<60*60>> MyHourTick;
  MyHourTick myHour(duration);
  std::cout << myHour.count() << " hours" << std::endl;
  
  typedef std::chrono::duration<double, std::ratio<60*60*24*365>> MyYearTick;
  MyYearTick myYear(duration);
  std::cout << myYear.count() << " years" << std::endl;

  typedef std::chrono::duration<double, std::ratio<60*45>> MyLessonTick;
  MyLessonTick myLesson(duration);
  std::cout << myLesson.count() << " lessons" << std::endl;

  std::cout << std::endl;

}

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// schoolDay.cpp

#include <iostream>
#include <chrono>

using namespace std::literals::chrono_literals;

int main(){

  std::cout << std::endl;

  constexpr auto schoolHour= 45min;

  constexpr auto shortBreak= 300s;
  constexpr auto longBreak= 0.25h;

  constexpr auto schoolWay= 15min;
  constexpr auto homework= 2h;

  constexpr auto schoolDayInSeconds= 2*schoolWay + 6 * schoolHour + 4 * shortBreak + longBreak + homework;

  std::cout << "School day in seconds: " << schoolDayInSeconds.count() << std::endl;

  std::chrono::duration<double,std::ratio<3600>> schoolDayInHours = schoolDayInSeconds;
  std::chrono::duration<double,std::ratio<60>> schoolDayInMinutes = schoolDayInSeconds;
  std::chrono::duration<double,std::ratio<1,1000>> schoolDayInMilliseconds= schoolDayInSeconds;

  std::cout << "School day in hours: " << schoolDayInHours.count() << std::endl;
  std::cout << "School day in minutes: " << schoolDayInMinutes.count() << std::endl;
  std::cout << "School day in milliseconds: " << schoolDayInMilliseconds.count() << std::endl;

  std::cout << std::endl;

}