Custom Alarm & Countdown Timer

Setting an Alarm Countdown Timer is simple: 1. Input Target Duration: Enter the desired minutes or select from quick preset buttons (e.g., 5 min tea timer, 25 min Pomodoro study timer, 45 min workout block). 2. Click "Start Timer": The engine computes the absolute target completion timestamp ($\text{Target End Time} = \text{Date.now()} + (\text{Minutes} \times 60,000\text{ ms})$). 3. Monitor Progress: The interface displays real-time remaining minutes and seconds alongside a circular progress bar. 4. Audio Alert on Completion: When the timer reaches zero, the audio chime sounds continuously until acknowledged. This tool is ideal for productivity focus intervals, culinary cooking, classroom exams, and presentations.

Yes! Modern web browsers throttle background tab timers (reducing `setInterval` ticks to conserve battery and memory). Because our timer anchors its countdown to an absolute target epoch timestamp (`Target End Time = Date.now() + duration`), it is completely immune to tab throttling. When you switch back to the timer tab, the engine calculates the true remaining time against the system clock instantaneously, ensuring your alarm triggers at the exact scheduled second.

The circular progress indicator dynamically computes the elapsed percentage: $\text{Percentage Complete} = ((\text{Total Duration} - \text{Remaining Duration}) / \text{Total Duration}) \times 100$. As time elapses, the SVG stroke progress smoothly transitions, providing visual feedback of remaining study or workout duration.