react-realtime-clock

react-realtime-clock is a simple and customizable React component that displays a real-time clock. With support for multiple time zones and various date formats, it makes it easy to integrate a clock into your React applications.

Table of Contents

• Installation
• Tailwind CSS Support
• Usage
• Props
• Examples
• Customization
• Hooks
• License

Installation

You can install the library using npm or yarn:

  npm install react-realtime-clock

Tailwind CSS Support

This library is styled using Tailwind CSS. To use the styles as intended, please ensure that Tailwind CSS is installed and configured in your project.

Usage

Here’s how to use the RealTimeClock component in your application:

import React from 'react';
import { RealTimeClock } from "react-realtime-clock";

const App = () => {
  return (
    <div className="app">
      <RealTimeClock
        timeZone="Asia/Kolkata"
        format="hh:mm:ss A"
        clockTextClassName="text-3xl font-bold text-white"
        containerClassName="bg-blue-600 p-4 rounded"
      />
    </div>
  );
};

export default App;

Props

Prop	Type	Default	Description
containerClassName	string	undefined	Additional class names for the container element.
clockTextClassName	string	undefined	Additional class names for the clock text element.
timeZone	TimezoneType	"UTC"	Time zone for the clock (e.g., "America/New_York").
format	FormatType	"HH:mm:ss"	Format for displaying the time (e.g., "hh:mm:ss A").
clockType	typeof DIGITAL_CLOCK_TYPE or typeof ANALOG_CLOCK_TYPE	DIGITAL_CLOCK_TYPE	Specifies whether to display a digital or analog clock.
clockSize	number	200	Size of the analog clock in pixels.
renderAnalogClockNumbers	boolean	true	Indicates whether to display numbers on the analog clock.

Examples

This section provides various examples of how to use the RealTimeClock component in your React application.

Example 1: Basic Clock

A simple example of a clock displaying the current time in UTC:

import React from 'react';
import { RealTimeClock } from "react-realtime-clock";

const App = () => {
  return (
    <div className="app">
      <RealTimeClock timeZone="UTC" format="HH:mm:ss" />
    </div>
  );
};

export default App;

Example 2: Clock with Custom Styles

Customize the appearance of the clock with additional class names:

import React from 'react';
import { RealTimeClock } from "react-realtime-clock";

const App = () => {
  return (
    <div className="app">
      <RealTimeClock
        timeZone="Europe/Berlin"
        format="MMMM Do YYYY, hh:mm A"
        clockTextClassName="text-2xl font-semibold text-gray-900"
        containerClassName="p-4 bg-gray-200 rounded-lg"
      />
    </div>
  );
};

export default App;

Example 3: Real-Time Clock with Different Time Zones

Display the clock with different time zones dynamically:

import React, { useState } from 'react';
import { RealTimeClock } from "react-realtime-clock";

const App = () => {
  const [timeZone, setTimeZone] = useState("Asia/Kolkata");
  const [format, setFormat] = useState("hh:mm:ss A");

  return (
    <div className="app">
      <RealTimeClock
        timeZone={timeZone}
        format={format}
        clockTextClassName="text-3xl font-bold text-white"
        containerClassName="bg-blue-600 p-4 rounded"
      />
      <select value={timeZone} onChange={(e) => setTimeZone(e.target.value)}>
        <option value="UTC">UTC</option>
        <option value="Asia/Kolkata">Asia/Kolkata</option>
        <option value="America/New_York">America/New_York</option>
        <option value="Europe/Berlin">Europe/Berlin</option>
        <option value="America/Los_Angeles">America/Los_Angeles</option>
      </select>
      <select value={format} onChange={(e) => setFormat(e.target.value)}>
        <option value="HH:mm:ss">HH:mm:ss</option>
        <option value="hh:mm:ss A">hh:mm:ss A</option>
        <option value="MMMM Do YYYY, h:mm:ss a">MMMM Do YYYY, h:mm:ss a</option>
        <option value="MM/DD/YYYY, h:mm A">MM/DD/YYYY, h:mm A</option>
      </select>
    </div>
  );
};

export default App;

Example 4: Full Customization with Analog Clock

Combine all props for a fully customized analog clock experience:

import React from 'react';
import { RealTimeClock } from "react-realtime-clock";

const App = () => {
  return (
    <div className="app">
      <RealTimeClock
        timeZone="Australia/Sydney"
        format="dddd, MMMM Do YYYY, hh:mm A"
        clockTextClassName="text-4xl font-extrabold text-yellow-500"
        containerClassName="flex items-center justify-center h-screen bg-gradient-to-r from-purple-500 to-blue-500"
        clockType={ANALOG_CLOCK_TYPE}
        clockSize={250}
        renderAnalogClockNumbers={true}
      />
    </div>
  );
};

export default App;

Customization

The RealTimeClock component offers various customization options, allowing you to tailor its appearance and functionality to fit your application’s design and requirements.

1. Styling the Clock

You can customize the appearance of the clock by using the following props:

• containerClassName: This prop allows you to add custom styles to the container of the clock. You can use any Tailwind CSS or custom class names here.

  <RealTimeClock
    containerClassName="bg-gray-800 p-4 rounded-lg shadow-lg"
  />

2. Time Zone Selection

The clock supports various time zones, which you can set using the timeZone prop. This prop accepts any valid IANA time zone string.

Example of setting the time zone to America/New_York:

<RealTimeClock timeZone="America/New_York" />

3. Time Format

The format prop allows you to specify how the time should be displayed. You can use the following format strings:

• "HH:mm:ss": 24-hour format
• "hh:mm:ss A": 12-hour format with AM/PM
• "MMMM Do YYYY, h:mm:ss a": Full month name and year
• "MM/DD/YYYY, h:mm A": US date format
• "YYYY-MM-DD HH:mm:ss": ISO date format
• "HH:mm": Simple hour and minute
• "hh:mm A": Simple hour and minute with AM/PM
• "dddd, MMMM Do YYYY": Full weekday name, month, and year

Example of setting the format to a 12-hour clock:

<RealTimeClock format="hh:mm:ss A" />

4. Clock Type

You can set the type of clock to either digital or analog using the clockType prop. You can also control the size of the analog clock using the clockSize prop.

Example of setting the clock to analog:

<RealTimeClock
  clockType={ANALOG_CLOCK_TYPE}
  clockSize={200}
  renderAnalogClockNumbers={true}
/>

5. Combining Customizations

You can combine the above customization options for a fully personalized clock display:

import React from 'react';
import { RealTimeClock } from "react-realtime-clock";

const App = () => {
  return (
    <div className="app">
      <RealTimeClock
        timeZone="Asia/Kolkata"
        format="hh:mm:ss A"
        clockTextClassName="text-3xl font-bold text-green-500"
        containerClassName="bg-gray-900 p-4 rounded-lg shadow-lg"
      />
    </div>
  );
};

export default App;

6. Responsive Design

The component is designed to be responsive. You can use Tailwind CSS utility classes to make it adapt to various screen sizes. For example, using responsive font sizes:

<RealTimeClock
  clockTextClassName="text-xl md:text-3xl lg:text-4xl"
/>

Hooks

useTimeElapsed

The useTimeElapsed hook is a custom hook that calculates the elapsed time from a specified target date in a specific time zone. It provides the flexibility to start and stop the counting based on provided conditions.

Example

import { useTimeElapsed } from "react-realtime-clock";

const App = () => {
  const timeElapsed = useTimeElapsed({
    targetDate: "2000-02-22T00:00:00Z", 
    timeZone: "Asia/Kolkata",
    countingConditions: {
      startCondition: true,
      stopCondition: false,  
    },
  });

  return <div>{timeElapsed}</div>;
};

Parameters

Parameter	Type	Default	Description
targetDate	string or Date	undefined	The date from which to calculate the elapsed time.
timeZone	TimezoneType	"Asia/Kolkata"	The time zone in which to calculate the elapsed time.
countingConditions	{ startCondition: boolean, stopCondition: boolean }	{ startCondition: false, stopCondition: false }	An object to control when to start and stop the counting.

Returns

• string: A formatted string representing the elapsed time based on the target date and time zone.

License

This project is licensed under the MIT License.

Summary of the MIT License

The MIT License is a permissive free software license that allows users to:

• Use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software.
• Allow others to do the same with their copies of the Software.

Conditions

The only conditions are:

• The above copyright notice and this permission notice must be included in all copies or substantial portions of the Software.
• The Software is provided "as is", without warranty of any kind. The authors are not liable for any damages or issues arising from its use.

For More Information

For the full text of the MIT License, please see the LICENSE file in this repository.