Browser extension · Chrome & Firefox
Convert timezones without leaving the page.
Select any time you're reading — a Unix epoch, an ISO string, or "Wednesday, October 28, 2026, 04:24 UTC" — and see it in your zones right there. No tab-switching. No mental math.
Free and open source · View on GitHub
Prefer a web app? No install needed.
A full timezone converter, right in your browser.
Paste an epoch, an ISO string, or a written date and read it across every zone — powered by the exact engine the extension ships.
Open the converter →Three ways to read a time right.
Every feature works where you already are — on the page, in a popup, no context-switching.
Select to convert
Highlight any time on any page. A small card shows it in your zones, right next to the text. Pin cards to compare several at once — each keeps its own colored highlight.
Full converter
A popup converter: pick a date and source zone, hit Local, and read it across every zone you care about. 12/24-hour, DST-correct.
Epoch & formats
Paste a Unix timestamp (seconds or milliseconds, auto-detected) or almost any written date. Add your own custom formats for the ones only your systems use.
Install in a minute.
Grab the latest release, then load it unpacked. Store listings coming soon.
Download
Get tz-extension-chrome.zip or tz-extension-firefox.zip from the latest release and unzip it.
Load it
Chrome/Edge: chrome://extensions → Developer mode → Load unpacked.
Firefox: about:debugging → Load Temporary Add-on → pick manifest.json.
Use it
Select any time on a page, or click the toolbar icon for the full converter. That's it.