useTimer

A hook that provides countdown timer functionality with pause, play, and reset controls. Perfect for implementing countdowns, timeouts, and time-based features.

Parameters

• startTime: string - Initial time in format “DD:HH:MM:SS”

Returns

• current: string - Current time in “DD:HH:MM:SS” format
• isPaused: boolean - Whether the timer is paused
• isOver: boolean - Whether the timer has finished
• currentDays: number - Current days remaining
• currentHours: number - Current hours remaining
• currentMinutes: number - Current minutes remaining
• currentSeconds: number - Current seconds remaining
• elapsedSeconds: number - Total seconds elapsed
• remainingSeconds: number - Total seconds remaining
• pause: () => void - Function to pause the timer
• play: () => void - Function to start/resume the timer
• reset: () => void - Function to reset to initial time
• togglePause: () => void - Function to toggle pause state

Usage

import { useTimer } from '@rhinolabs/react-hooks';

function Countdown() {
  const {
    current,
    isPaused,
    isOver,
    togglePause,
    reset
  } = useTimer('00:01:30:00'); // 1 hour 30 minutes

  return (
    <div>
      <h2>Time Remaining: {current}</h2>

      <button onClick={togglePause}>
        {isPaused ? 'Resume' : 'Pause'}
      </button>

      <button onClick={reset}>
        Reset Timer
      </button>

      {isOver && (
        <div>Time's up!</div>
      )}
    </div>
  );
}

Notes

• Accepts time in “DD:HH:MM:SS” format
• Updates every second
• Provides formatted and parsed time values
• Includes pause/play/reset controls
• Tracks elapsed and remaining time
• Handles timer completion
• Auto-cleanup on unmount