The latest Microsoft Windows operating systems have a built-in time synchronisations services. Windows 2000 and later operating systems have, by default, the windows time service installed, called w32..

NTP, or Network Time Protocol, was invented over 25 years ago as a means of synchronising time critical processes over the Internet. It is one of the oldest Internet protocols still in use today. NTP ..

The Global Positioning System (GPS) is a satellite navigation system operated by the US military. It has a subscription-free civilian time and navigation element. The system is primarily intended as a..