A fast, account-free timezone comparison tool built around an interactive world map. Inspect a location, explicitly add it to your comparison, compare live local clocks, reorder cards, choose a Home timezone, and find shared working hours. Preferences stay in your browser.
Live site: tz.rztaylor.chatgpt.site
npm install
npm run devOpen the local URL printed by Vite. Press ⌘ K or Ctrl K to search for a city, country, timezone, abbreviation, or UTC offset.
The offline city catalog includes major cities worldwide. Country panels show a short
default list and offer a filter for larger catalogs. City data is derived from
GeoNames under CC BY 4.0;
the source extract is cities15000.zip from the GeoNames download.
Regenerate the bundled selection with node scripts/build-city-catalog.mjs /path/to/cities15000.zip.
npm run check
npm run test:browserThe browser suite requires Playwright Chromium (npx playwright install chromium). The product specification lives in docs/PRODUCT.md, with repository policies in .agents/facts/.