World Clock Webservice?

Question

What is the most reliable World Clock Webservice that you use?

Answer 1

Unfortunately, you'll probably never get a really accurate atomic clock webservice due to latency issues with the transport of the messages/packets back and forth from your machine to the server.

Most atomic clocks that are accessible over the internet use a specific protocol called the Network Time Protocol that includes a jitter buffer which specifically accounts for and adjusts based upon the latency of the transport. This provides a more accurate representation of the atomic clock's time than using a web-service over HTTP.

I think if you must use a webservice, the most accurate one will be the one hosted on a server that is physically and geographically closest to you and also has the least number of network hops to get from your own machine to the server, since this will reduce the latency of the packets.