TimeSync is described as 'gets the current time from a NIST server, and adjusts the PC clock if necessary. Accuracy is usually within a second. Time and date are displayed according to the users regional settings' and is an app in the os & utilities category. There are more than 10 alternatives to TimeSync for Windows and Linux. The best alternative is NetTime, which is both free and Open Source. Other great apps like TimeSync are Time-Sync, Atomic Clock Time Synchronizer, Meinberg NTP and Chrony.
Atomic Clock Time Synchronizer is a useful and handy utility to keep your PC clock accurate. It periodically checks and synchronizes your computer clock with NIST atomic time servers, or synchronizes time between computers.
NTP client and server download for different operating systems. GUI setup program, full HTML documentation, OpenSSL (Version 0.9.8l) DLL. The installer has been successfully tested on a Preview version of Windows 8 as well.
AboutTime is a superior source of time for your computer. As a time client, it will acquire time from the Internet with great accuracy, and as a server it will provide four kinds of time signals to other computers on your local network.
The Network Time Protocol daemon (ntpd) is an operating system daemon program that maintains the system time in synchronization with time servers using the Network Time Protocol (NTP). This package is the official reference implementation of the NTP protocol.
Neutron is a very simple and small time synchronizing program that retrieves the accurate time from one of several specialized time servers on the Internet. Once the network time has been retrieved the program can set your computers clock to match it.