About Time Dozen

Time Dozen is a free reference for the current local time in countries, regions and cities, and for the time zones that connect them.

What the site does

It answers three questions quickly: what time is it there, what is the difference between two places, and when does the clock change next. Pages are plain and fast, and the clocks are rendered on the server so the time is visible immediately.

Data sources

GeoNames for place names, coordinates and population (CC BY 4.0).
The IANA time zone database for offsets and daylight saving rules.
Wikipedia (CC BY-SA) for the This day in history page.

How times are calculated

The server computes the time of each place from the IANA rules through a maintained tzdb package, and sunrise and sunset with the suncalc library from the place's coordinates. The browser then keeps the clock running.

Privacy by design

No accounts and no advertising cookies. Preferences stay in your browser. Traffic is measured with Google Analytics and Cloudflare Web Analytics; see the privacy policy.

Status

The name Time Dozen is provisional while the project is being built. The site is independent and not affiliated with any government or standards body.