Clock
The time now. Time elapsed. Time remaining.
How to use ↓Uses your device clock without synchronizing to a time server.
Stopwatch
Ready
| Lap | Split time | Total time |
|---|
Countdown timer
Ready
No stored inputs, records or uploads. Reloading or closing the page resets everything.
Keep track of time, simply.
Switching tabs here keeps the stopwatch and timer running.
- 01
Check the current time
Choose device local time, Korean time or UTC.
- 02
Measure elapsed time
Start the stopwatch and record laps. Pause and resume when needed. Resetting also clears the laps.
- 03
Set a countdown
Set a duration from 1 second to 99 hours, 59 minutes and 59 seconds. Sound is optional; completion also appears on screen and in the page title.
Use a dedicated alarm for critical reminders.
Screen lock, device sleep and background tabs can delay or prevent execution and sound. Remaining time is recalculated on return, but an on-time alarm is not guaranteed.
Frequently asked questions
Does switching clock tabs stop the timer?
Switching tabs within this page does not stop timing. Navigating away or reloading can lose your records. Records are not saved.
How is time measured?
Timing uses start and end timestamps, not screen refresh counts. Changing the device clock can affect measurements. A 0.01-second display does not guarantee that accuracy.
What if the completion sound is silent?
Enable sound before starting and check device volume. Autoplay restrictions, mute settings and sleep can prevent sound. No OS notifications are sent.