Does the countdown keep running if I close the tab?

It runs while the page is open. When you reopen it with the same target, it recalculates the remaining time from the current moment.

Which time zone is used?

The target is interpreted in your local time zone, so the countdown matches the clock on the device you are using.

Count down to a future date and time you choose—launches, holidays, deadlines, or personal goals. Runs in the browser while the tab stays open.

Pick a date and time; see time remaining until then.

Target (local)

Time left0:59:33

Example: Set countdown to product launch day at 09:00 local time.

Does the countdown keep running if I close the tab?: It runs while the page is open. When you reopen it with the same target, it recalculates the remaining time from the current moment.
Which time zone is used?: The target is interpreted in your local time zone, so the countdown matches the clock on the device you are using.