Andreas Software
Free programs for Windows by Andreas Jönsson


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

No screenshot available.

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.


> Download AS-TimeSync 1.21 (Zip, 34.3 kB)

Revision Date: 2022-07-04.
License: Freeware.
Unicode Support: Yes.
Program Type: Fully portable, x64.
Operating System(s): Windows 7, 8, 8.1, 10 and 11. (Also the Server versions.)
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.

What was the difference?

What was the difference?
What was the difference?

Use the parameter "/UI" to show a message box telling you the difference.


This program complies to RFC 868 (Time Protocol) where the smallest unit is one second. The program connects to "" on TCP port 37 and reads 4 Bytes.

Administrative rights

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.