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React timer hook is a custom react hook built to handle timers(countdown), stopwatch and time logic/state in your react component.

Package Exports

  • react-timer-hook
  • react-timer-hook/dist/index.js

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (react-timer-hook) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

react-timer-hook

React timer hook is a custom react hook, built to handle timer, stopwatch, and time logic/state in your react component.

  1. useTimer: Timers (countdown timer)
  2. useStopwatch: Stopwatch (count up timer)
  3. useTime: Time (return current time)

Setup

yarn add react-timer-hook OR npm install --save react-timer-hook

useTimer - Demo

Example

import React from 'react';
import { useTimer } from 'react-timer-hook';

function MyTimer({ expiryTimestamp }) {
  const {
    totalSeconds,
    milliseconds,
    seconds,
    minutes,
    hours,
    days,
    isRunning,
    start,
    pause,
    resume,
    restart,
  } = useTimer({ expiryTimestamp, onExpire: () => console.warn('onExpire called'), interval: 20 });


  return (
    <div style={{textAlign: 'center'}}>
      <h1>react-timer-hook </h1>
      <p>Timer Demo</p>
      <div style={{fontSize: '100px'}}>
        <span>{days}</span>:<span>{hours}</span>:<span>{minutes}</span>:<span>{seconds}</span>:<span>{milliseconds}</span>
      </div>
      <p>{isRunning ? 'Running' : 'Not running'}</p>
      <button onClick={start}>Start</button>
      <button onClick={pause}>Pause</button>
      <button onClick={resume}>Resume</button>
      <button onClick={() => {
        // Restarts to 5 minutes timer
        const time = new Date();
        time.setSeconds(time.getSeconds() + 300);
        restart(time)
      }}>Restart</button>
    </div>
  );
}

export default function App() {
  const time = new Date();
  time.setSeconds(time.getSeconds() + 600); // 10 minutes timer
  return (
    <div>
      <MyTimer expiryTimestamp={time} />
    </div>
  );
}

Settings

key Type Required Description
expiryTimestamp Date object YES this will define for how long the timer will be running
autoStart boolean No flag to decide if timer should start automatically, by default it is set to true
interval number No value to change the interval of the timer, by default it is set to 1000ms. Note: this value will not affect the timer, it will just define the frequency used to calculate the current timer values. For example, if you have a use case where milliseconds are used, you need to use a smaller value for the interval, for example, 20ms or 100ms based on your needs.
onExpire Function No callback function to be executed once countdown timer is expired

Values

key Type Description
milliseconds number milliseconds value, to get accurate ms values you need to set interval to a smaller value example: 20ms
seconds number seconds value
minutes number minutes value
hours number hours value
days number days value
totalSeconds number total number of seconds left in timer NOT converted to minutes, hours or days
totalMilliseconds number total number of milliseconds left in timer NOT converted to minutes, hours or days
isRunning boolean flag to indicate if timer is running or not
pause function function to be called to pause timer
start function function if called after pause the timer will continue based on original expiryTimestamp
resume function function if called after pause the timer will continue countdown from last paused state
restart function function to restart timer with new expiryTimestamp, accept 2 arguments first is the new expiryTimestamp of type Date object and second is autoStart of type boolean to decide if it should automatically start after restart or not, default is true

useStopwatch - Demo

Example

import React from 'react';
import { useStopwatch } from 'react-timer-hook';

function MyStopwatch() {
  const {
    totalSeconds,
    milliseconds,
    seconds,
    minutes,
    hours,
    days,
    isRunning,
    start,
    pause,
    reset,
  } = useStopwatch({ autoStart: true, interval: 20 });


  return (
    <div style={{textAlign: 'center'}}>
      <h1>react-timer-hook</h1>
      <p>Stopwatch Demo</p>
      <div style={{fontSize: '100px'}}>
        <span>{days}</span>:<span>{hours}</span>:<span>{minutes}</span>:<span>{seconds}</span>:<span>{milliseconds}</span>
      </div>
      <p>{isRunning ? 'Running' : 'Not running'}</p>
      <button onClick={start}>Start</button>
      <button onClick={pause}>Pause</button>
      <button onClick={reset}>Reset</button>
    </div>
  );
}

export default function App() {
  return (
    <div>
      <MyStopwatch />
    </div>
  );
}

Settings

key Type Required Description
autoStart boolean No if set to true stopwatch will auto start, by default it is set to false
offsetTimestamp Date object No this will define the initial stopwatch offset example: const stopwatchOffset = new Date(); stopwatchOffset.setSeconds(stopwatchOffset.getSeconds() + 300); this will result in a 5 minutes offset and stopwatch will start from 0:0:5:0 instead of 0:0:0:0
interval number No value to change the interval of the stopwatch, by default it is set to 1000ms. Note: this value will not affect the stopwatch, it will just define the frequency used to calculate the current timer values. For example, if you have a use case where milliseconds are used, you need to use a smaller value for the interval, for example, 20ms or 100ms based on your needs.

Values

key Type Description
milliseconds number milliseconds value, to get accurate ms values you need to set interval to a smaller value example: 20ms
seconds number seconds value
minutes number minutes value
hours number hours value
days number days value
totalSeconds number total number of seconds in stopwatch NOT converted to minutes, hours or days
isRunning boolean flag to indicate if stopwatch is running or not
start function function to be called to start/resume stopwatch
pause function function to be called to pause stopwatch
reset function function to be called to reset stopwatch to 0:0:0:0, you can also pass offset parameter to this function to reset stopwatch with offset, similar to how offsetTimestamp will offset the initial stopwatch time, this function will accept also a second argument which will decide if stopwatch should automatically start after reset or not default is true

useTime - Demo

Example

import React from 'react';
import { useTime } from 'react-timer-hook';

function MyTime() {
  const {
    milliseconds,
    seconds,
    minutes,
    hours,
    ampm,
  } = useTime({ format: '12-hour', interval: 20 });

  return (
    <div style={{textAlign: 'center'}}>
      <h1>react-timer-hook </h1>
      <p>Current Time Demo</p>
      <div style={{fontSize: '100px'}}>
        <span>{hours}</span>:<span>{minutes}</span>:<span>{seconds}</span><span>{milliseconds}</span><span>{ampm}</span>
      </div>
    </div>
  );
}

export default function App() {
  return (
    <div>
      <MyTime />
    </div>
  );
}

Settings

key Type Required Description
format string No if set to 12-hour time will be formatted with am/pm
interval number No value to change the interval of the time, by default it is set to 1000ms. Note: this value will not affect the thime, it will just define the frequency used to calculate the current time values. For example, if you have a use case where milliseconds are used, you need to use a smaller value for the interval, for example, 20ms or 100ms based on your needs.

Values

key Type Description
milliseconds number milliseconds value
seconds number seconds value
minutes number minutes value
hours number hours value
ampm string am/pm value if 12-hour format is used

Deprecation Warning:

Starting from v1.1.0 and above default export useTimer is deprecated, your old code will still work but it is better to start using named exports { useTimer, useStopwatch, useTime }