Andreas Software
Free programs for Windows by Andreas Jönsson


AS-TimeSync 1.21 - Synchronize the computer's clock over the Internet.

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A program that quickly synchronizes the computer's clock against a time server ( over the Internet. The program shows nothing on the screen, it only adjusts the time and then quits.


  • Sets the whole computer's clock, including the date, to current date and time which makes it entirely correct.
  • Do you have to set the computer's clock every time it has been off? Then probably your CMOS battery is exhausted and should be replaced, until you have replaced your battery is AS-TimeSync very handy in this situation.
  • Use the parameter "/UI" to show a message box telling you the difference.
  • It doesn't matter what time zone you are located in, because it's already specified in your operating system.

> Download AS-TimeSync 1.21 (Zip, 35 kB)

Revision Date: See file date.
License: Freeware.
Unicode Support: Yes.
Program Type: Portable, x64.
Operating System(s): Windows 7 (SP1+), 8.1 and 10. (Also Windows Server 2012 R2 and 2016.)
Language(s): English and Swedish.

This is the program's official website - download the program here to get the latest version/revision. The program is free.


This program complies to RFC 868 (Time Protocol) where the smallest unit is one second. The program connects to "" on TCP port 37.

Information regarding UAC

If you have User Account Control (UAC) activated you have to allow running AS-TimeSync as Administrator in order to change the system time.

Automatic start

Use the Windows tool "Task Scheduler" if you want the time to be adjusted automatically when you login to Windows. Check "Run with highest privileges" for the program being able to change the system time.

Copyright © 1998-2019, Andreas Jönsson. All rights reserved.

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