Does the countdown keep running if I close the tab?

No — JavaScript timers only run while the tab is open. Keep this tab open (or in a background window) for the countdown to fire.

Will I get a notification when it ends?

You'll see an in-page toast confirming the moment. Browser-level notifications require additional permissions and aren't enabled by default.

This tool runs one countdown at a time for clarity. Open the tool in another tab to run a second one in parallel.

The tool prevents you from starting a countdown to a past time — choose a future moment instead.

Yes. It recomputes the remaining time from the absolute target timestamp every 250ms, so it stays accurate even if the tab is briefly throttled.

Count down to any future date — days, hours, minutes, seconds.

100% private — no uploads Date & Time ToolsFree & unlimited Read tutorial

Watch a quick simulation of this tool in action — no file needed.

Follow these steps — everything happens instantly in your browser.

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Step 1. Pick a target date and time in the future using the datetime picker.
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Step 2. Click Start to begin the live countdown — days, hours, minutes and seconds tick down.
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Step 3. Pause, resume or reset at any time. The countdown continues as long as the tab is open.
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Step 4. When the timer reaches zero, a toast confirms the moment has arrived.