Таймер с указанием часов, минут и секунд

#include <iostream>
#include <ctime>
#include <thread>
#ifdef _WIN32
    #include <Windows.h>
    #pragma comment (lib, "Winmm.lib")
#endif // _WIN64
 
int main()
{
    uint64_t hours = 0;
    std::cout << "Enter hours: ";
    std::cin >> hours;
    std::cin.ignore();
 
    uint64_t minutes = 0;
    std::cout << "Enter minutes: ";
    std::cin >> minutes;
    std::cin.ignore();
 
    uint64_t seconds = 0;
    std::cout << "Enter seconds: ";
    std::cin >> seconds;
    std::cin.ignore();
    
    int64_t target = hours * 3600 + minutes * 60 + seconds;
    int64_t current = time(0);
 
    while (target > 0)
    {
        int64_t delta = time(0) - current;
        current = time(0);
        target -= delta;
 
        system("cls");
        int64_t hours = target / 3600;
        std::cout << "Hours: " << target / 3600 << " Minutes: " << (target - (hours * 3600)) / 60 << " Seconds: " << target % 60 << std::endl;
        std::this_thread::sleep_for(std::chrono::milliseconds(500));
    }
#ifdef _WIN32
 
    MessageBox(NULL, L"TIME IS OUT!", L"TIME OUT!", 0);
    PlaySound(TEXT("SystemStart"), NULL, SND_ALIAS);
#endif // _WIN64
 
    system("cls");
 
}