The site http://time.is provides accurate time data in your browser. They claim that their time source is “synchronized to an atomic clock”, without elaboration. (Big Deal. Your GPS device is “synchronized to an atomic clock”, also.) Time.is claims precision to within 20 to 100 milliseconds. I imagine that the largest contributor to inaccuracy is the undefined and variable propagation delay as packets traverse the Internet.
The site is hosted in Norway and is mobile-responsive. This screenshot is from my Android phone.
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© Russ Bellew · Fort Lauderdale, Florida, USA · phone 954 873-4695