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Digital Clock starting from user set time in C++

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In this article, we will discuss the Digital Clock in C++ Language. It is an application that allows for a personal clock that starts at a custom set time and shows the time from that point onwards. This article describes how to make such a clock in a 24-hour format with HH:MM:SS slots and start the time from where one would want it to be, and then it moves forward from there.

Features: It is a Simple Digital clock developed using basic C++ concepts that shows hour, minute, and second.

Approach: The requirements for this program are just the basic concepts of the data types, variables, manipulators, Control statements, Conditional statements, etc. Below are the steps:

  • Create a screen that will show “Current time” of your location which will be implemented using simple output methods used in C++ i.e., cout, and a manipulator “setw()“.
  • In the fore mentioned screen, implement the HH column, MM column, SS column, that will contain the time.
  • Implement colors using System(“color 4A”), the color will be in hexadecimal format and the console can be used to implement them using double-digit hex codes (0 to F) which will, in turn, change the text color in the console of the output.
  • In the last screen, a digital clock can be seen finally implemented and running from the inputted time.

Functions Used:

  • System(“cls”): It is used to clear the Console or the Screen. It can be avoided if anyone wants to see whatever is appearing on the screen.
  • setw(): This function is used to leave the space of particular characters that you can write in the parenthesis. It is declared in <iomanip> header file. Here setw(70) is used.
  • System(“color 4A”): This function is used to make background RED and text as LIGHT GREEN.
  • Sleep(): sleep is a function that is declared in <windows.h> header file. It actually suspends the execution of the program temporarily for a period of time in milliseconds.

Below is the implementation of the above approach:


// C++ program to illustrate the digital
// clock starting from the entered time
#include <iomanip>
#include <iostream>
#include <stdlib.h>
#include <windows.h>
using namespace std;
// Driver Code
int main()
    system("color 4A");
    // Background color and Foreground
    int hour, min, sec;
    cout << setw(70)
         << "*Enter Current time*\n";
    // Use of manipulator for taking
    // input from the user
    cout << "HH- ";
    cin >> hour;
    cout << "MM- ";
    cin >> min;
    cout << "SS- ";
    cin >> sec;
    // Background color and the
    // Foreground for 2nd screen
    system("color 4A");
    // Cases for the Wrong Time Input
    if (hour > 23) {
        cout << "Wrong Time input";
    else if (min > 60) {
        cout << "Wrong Time Input";
    else if (sec > 60) {
        cout << "Wrong Time Input";
    // Otherwise
    else {
        while (1)
        // Run Block infinitely
            // Clear the console
            // Code for Showing Time
            for (hour; hour < 24; hour++) {
                for (min; min < 60; min++) {
                    for (sec; sec < 60; sec++) {
                        cout << "\n\n\n\n~~~~~~~~~"
                                "Current Time = "
                             << hour << ":" << min << ":"
                             << sec
                             << "Hrs~~~~~~~~~~~~~~~~~~"
                        // HH:MM:SS columns in output
                        // Pause for 1 sec
                    sec = 0;
                min = 0;




Last Updated : 25 Mar, 2021
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