oldest_time.cpp

#include <iostream>
#include <chrono>
#include <thread>
#include <vector>
#include <algorithm>
#include <iterator>
#include <random>


using namespace std;
using namespace std::chrono;
using namespace std::literals::chrono_literals;

void print_time_point(time_point<system_clock> t)
{
    auto ttp = system_clock::to_time_t(t);
    cout << ctime(&ttp);
}

int main()
{
    vector<time_point<system_clock>> arr;
    cout << "adding time points\n";
    for (auto i = 0 ; i < 10 ; ++i)
    {
        arr.push_back(system_clock::now());
        this_thread::sleep_for(1s);
    }
    
    for_each(arr.begin(),arr.end(),print_time_point);
    sort( arr.rbegin(),arr.rend());
    for_each(arr.begin(),arr.end(),print_time_point);
    auto result = min_element(arr.begin(),arr.end());
    cout << "result\n";
    print_time_point(*result);
    
    return 0;
}