C plus plus program to find the current time?

Here is a simple C++ program that displays the current system time using the C++ standard library (<ctime> and <iostream>):

#include <iostream>
#include <ctime>

int main() {
    // Get current time as time_t object
    time_t now = time(0);

    // Convert to local time structure
    tm *localTime = localtime(&now);

    // Display the current time
    std::cout << "Current Time: ";
    std::cout << localTime->tm_hour << ":"
              << localTime->tm_min << ":"
              << localTime->tm_sec << std::endl;

    return 0;
}

Example Output:

sql
Current Time: 14:35:27

Explanation:

• time(0) gets the current time as seconds since the Epoch (January 1, 1970).

• localtime() converts that to a tm structure containing local time info.

• tm_hour, tm_min, and tm_sec give hours, minutes, and seconds.

Let me know if you want it in 12-hour format, with AM/PM, or using C++20 <chrono> instead.

1. Current Time with Date and AM/PM Format

#include <iostream>
#include <ctime>
#include <iomanip>

int main() {
    time_t now = time(0);
    tm *localTime = localtime(&now);

    int hour = localTime->tm_hour;
    std::string meridian = (hour >= 12) ? "PM" : "AM";
    hour = (hour % 12 == 0) ? 12 : hour % 12;  // Convert to 12-hour format

    std::cout << "Current Date: "
              << (localTime->tm_mday) << "/"
              << (localTime->tm_mon + 1) << "/"
              << (localTime->tm_year + 1900) << std::endl;

    std::cout << "Current Time: "
              << std::setw(2) << std::setfill('0') << hour << ":"
              << std::setw(2) << std::setfill('0') << localTime->tm_min << ":"
              << std::setw(2) << std::setfill('0') << localTime->tm_sec << " "
              << meridian << std::endl;

    return 0;
}

---

✅ 2. Using C++20 <chrono> Library (Modern Approach)

⚠️ Requires C++20 standard compiler support.

#include <iostream>
#include <chrono>
#include <format>   // C++20
#include <ctime>

int main() {
    auto now = std::chrono::system_clock::now();
    std::time_t t = std::chrono::system_clock::to_time_t(now);

    std::cout << "Current Time: " << std::format("{:%d-%m-%Y %I:%M:%S %p}", *std::localtime(&t)) << std::endl;

    return 0;
}

---

✅ 3. Realtime Clock Refreshing Every Second (Like a Clock)

#include <iostream>
#include <ctime>
#include <thread>
#include <chrono>

int main() {
    while (true) {
        std::system("clear"); // use "cls" on Windows
        time_t now = time(0);
        tm *localTime = localtime(&now);

        std::cout << "Current Time: "
                  << std::setw(2) << std::setfill('0') << localTime->tm_hour << ":"
                  << std::setw(2) << std::setfill('0') << localTime->tm_min << ":"
                  << std::setw(2) << std::setfill('0') << localTime->tm_sec << std::endl;

        std::this_thread::sleep_for(std::chrono::seconds(1));
    }
    return 0;
}

---

🔧 To Compile and Run:

• Linux/macOS (g++):

  g++ -std=c++20 filename.cpp -o timeapp
  ./timeapp
  

• Windows (g++ or Dev C++):

  • Replace system("clear") with system("cls") for clearing the screen.