PC Atomic Sync
by Brigsoft

  (*) It is an atomic clock synchronizer with some useful features (time offset, synchronize periods, etc.). The main idea of the program is to synchronize your PC's clock in the most reliable and resource-saving way.
(*) The unique Time Offset feature of the program allows setting up your PC clock to gain or to lose for a specified interval. Many our users value this feature greatly.
(*) Clock in your PC needs to be corrected only several times a month. And it is this fact that defines the way the program works: the program runs when Windows starts, checks whether synchronization has been done this day already, and stops immediately if so. Otherwise the program checks for Internet connection, then tries to synchronize your clock and ends its work if succeeded. So as you see mostly the program is idle and is not wasting resources of your PC. Synchronization is done automatically while you are receiving your e-mail or surfing the web and no actions are to be done by you. 
(*) The program features noteworthy reliability. You can specify the correction period during which the program should synchronize your clock. If it fails user gets a warning notification message.
(*) This program uses the list of 19 presetting atomic time servers, that are situated all over the world (USA, UK, Australia, France, Germany etc.). They are open NTP (Network Time Protocol) servers. If one of the servers does not work the program chooses another. There is a procedure that tests all servers and shows network delays for them. User can add additional servers to the list. It is really important only for professional users. Any server allows you synchronize your computer with precision less then 0.1 sec with high probability.

(*) As a result you don't have to do anything, mostly the program is not wasting resources of your PC but your PC clock always shows you precise time.

Related software:
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