CountdownStopwatch

Date Tools

Time Zone Converter

Convert selected dates and times between IANA time zones while showing date changes.

00:05:00

Ready

Alarm

Keyboard: Space starts or pauses, R resets, F opens fullscreen, M mutes, Arrow Up adds time, Arrow Down subtracts time. Browser alarms depend on the tab and device staying available.

How to use Time Zone Converter

Set the values you need, press Start, and keep this browser tab open. Most tools store only practical preferences locally in your browser.

Timer accuracy is based on timestamps, so the display corrects itself after tab backgrounding. Browser alarms and notifications still depend on browser permission, power state, and open-tab behavior.