Browser extension · Chrome & Firefox
Convert timezones without leaving the page.
Select any time you're reading — a Unix epoch, an ISO string, 22.03.2024 14:05, or "Wednesday, October 28, 2026, 04:24 UTC" — and see it in your zones right there. No tab-switching. No mental math.
Edge and Brave install from the Chrome Web Store · 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 your zones — powered by the exact engine the extension ships. Your zones are saved in this browser and shared with the world clock.
Everything you need to read a time right.
Every feature works where you already are — on the page, in a popup, or in a full-page world clock.
Select to convert
Highlight any time on any page and a small card shows it in your zones, right next to the text. Your selection stays put, so Ctrl/⌘ C still copies exactly what you highlighted. Prefer no pop-ups? Turn it off and right-click a selection instead.
100+ date formats
Epochs (seconds or milliseconds), ISO 8601 with week and ordinal dates, European day-first dates like 22.03.2024, compact 19990322, Unix date output and more. When 03/04/2024 could be either, pick day-first or month-first once. Add your own formats with a live tester.
Search every zone
Find zones by city, region, offset or abbreviation: Kathmandu, UTC+05:45, PDT, EDT. Drag your zones into the order you want, or move them with Alt+arrow keys.
Pin and compare
Pin cards to compare several times at once, each with its own colored highlight. A pin dock minimizes, expands, unpins or closes them all in one click. Cards open compact, full, or at the size you used last.
World clock
A full-page board of your zones with day and night, the gap from home, and working hours at a glance. Drag the time scrubber to plan a meeting across every zone. Open the world clock →
Converter & settings
A popup converter with a date picker and an epoch tab, 12/24-hour and DST-correct. Settings are grouped into tabs — General, Cards, Timezones, Formats — on one scrolling page.
Install in a minute.
Get it from your browser's add-on store. Edge, Brave and other Chromium browsers install it from the Chrome Web Store.
Add it
Open the Chrome Web Store or Firefox Add-ons page and click Add. Updates arrive automatically.
Pin it
Pin the TZ icon from your browser's extensions menu so the converter is one click away.
Use it
Select any time on a page, or click the toolbar icon for the full converter. That's it.
Or load it unpacked from the latest release: unzip tz-extension-chrome.zip and use chrome://extensions → Developer mode → Load unpacked, or unzip tz-extension-firefox.zip and use about:debugging → Load Temporary Add-on → pick manifest.json.