A Chrome and Firefox browser extension that lets you highlight any natural-language date/time text on a webpage, right-click → Timezone Translate, and instantly see the time converted to your local timezone.

• Natural language parsing — understands virtually any date/time format: Feb 19th | 6:00 PM ET, 9am-5pm PST, Thursday at noon, 14:00 UTC, and more
• Auto-detects timezone — recognizes abbreviations (EST, ET, PST, PT, GMT, CET, etc.) and plain English names (Eastern, Pacific, Central) in the selected text
• Range support — converts both endpoints of a time range (e.g. 9:00 AM – 1:00 PM)
• Live dropdowns — change the source or target timezone and the result updates instantly
• Copy to clipboard — one click copies the converted time
• Shadow DOM isolation — the dialog doesn't interfere with host-page styles
• Chrome + Firefox — works as an MV3 extension in Chrome/Edge and via about:debugging in Firefox

https://chromewebstore.google.com/detail/timezone-translator/lepkpohecahdpiecemipligdiamjmjem

https://addons.mozilla.org/en-US/firefox/addon/timezone-translator/

git clone git@github.com:silverbucket/timezone-translate.git
cd timezone-translate
npm install
npm run build

Then load the dist/ folder as an unpacked extension:

• Chrome/Edge: chrome://extensions → enable Developer mode → Load unpacked → select dist/
• Firefox: about:debugging → This Firefox → Load Temporary Add-on → select dist/manifest.json

npm run watch

1. Select any text containing a date/time on any webpage
2. Right-click → Timezone Translate
3. The dialog shows the converted time
   • From is pre-filled if a timezone was detected in the text
   • To defaults to your system's local timezone
4. Adjust either dropdown to update the result live
5. Click Copy to Clipboard to copy the result