Best Free Time Correction Utility


A lot of folks have difficulty getting time correction software to work on their PC. If that's you, then you should try out the free products reviewed in this article.

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Go to details...  Go straight to the Quick Selection Guide


Dimension 4 gives you the choice of connecting to a time server either by standard TCP protocol or by the more common (and more problem-prone) SNTP protocol.

If you haven't yet got a time correction utility, this is the one. It's easy to use, and has every function that you could conceivably want.

This application works from both the command line and Windows, and it's ideal for batch files too.

Related Products and Links

You might want to check out these articles too:

Quick Selection Guide

Dimension 4
Runs as a stand-alone program on a user's computer
Easy to use, and has many functions. Works from both the command line and Windows and is ideal for batch files.
363.5 KB
32 bit only
Free for private use only
There is no portable version of this product available.
Windows 95 to XP


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correct, system, time, windows, tool

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by CrashDC on 24. July 2014 - 20:56  (117557)

As of (at least) July, 2014, this program has been updated to run on Windows 7 (and, probably W8). This is version 5.3 I had been using 5.0-something and it didn't work. I was also under the impression that this software was no longer going to be updated, and I'm very glad to see that it has been.

Free, accurate, customizable... what's not to like? :)

by NCudmore (not verified) on 26. May 2012 - 7:12  (93970)

Anyone know of a time sync which will use the Windows 7 location sensor. I have a built in GPS which gives acurate UTC time and location. The standard Windows 7 Weather gadget picks up the current location from the location sensor and gives local weather.

I saw the tread on IP geo-location, but location sensor is some what more reliable.

On another thought what about picking up th time from a 3g/4g broadband modem in the same way a mobile phone pick's up the current time?

by Franz G (not verified) on 9. March 2012 - 11:45  (90130)

lots of interesting suggestions, but i found this article:

So i think the best idea to get time from a NTP server is to work with the original NTP software, which can be downloaded from Meinberg.

by Derek Iannelli-Smith (not verified) on 16. August 2011 - 1:50  (77712)

Actually there is a cool FREEware utility called SymmTime at:

and it is a 2011 version!!!

by John Crumpton (not verified) on 30. March 2012 - 8:32  (91415)

Ugly interface - puts a grey analogue clock on your screen and didn't sync my time.

by HedRat (not verified) on 28. April 2011 - 12:47  (71055)

Somebody else recommended the utility called Neutron ( It can be configured to run from the command line (we're running it non-interactively too). Just configure the .ini file with the NTP servers you want or leave the existing selection, and change the flags to auto-sync and exit on completion (the other flag is to set the initial NTP server selection). Works brilliantly, even if the clock is completely out.

by Anonymous1234 (not verified) on 29. January 2011 - 15:33  (65445)

For microsecond accuracy under Windows 7, use Meinberg NTP software at and its companion monitor at

Be sure to right-click on each install EXE and choose Run As Administrator or it won't install correctly! I also do not install anything into Windows 7 C:\Program Files directory but instead to C:\MyProgramFiles. This seems to resolve a lot of permission issues Windows 7 likes to throw on the Program Files directory.

by Anonymous1234 (not verified) on 29. January 2011 - 15:50  (65446)

I meant to say millisecond accuracy not microsecond....

by Robaye (not verified) on 23. October 2010 - 18:29  (60013)

Here is another simple one--I have been using for some time.. I don't need it on Vista, though, as one is built included with the OS (Internet Time tab via the clock.)

WebTime 2000

by outoftime (not verified) on 3. July 2010 - 2:14  (53667)

NTP pool addresses are useful. A pool address is a virtual cluster of timeservers. There are currently 2000+ servers in the pool.

For example, use "" instead of "" to access a pool of 510 time servers in the USA. There are 100's of other pool server addresses all over the world, you can pick a pool closest to you.

Setting up NTP on Win Vista/7:

More info on pool servers here: and

by Awgeewhiz on 9. July 2010 - 14:57  (53999)

May also want to look at: SP TimeSync -

32 and 64 bit versions available, free for private use.

And has silent no-pop-up command line sync.

by Court (not verified) on 2. July 2010 - 21:48  (53653)

For those interested in a simple behind-the-scene time sync program that works in Windows 7, I suggest Time-Sync. It will sync the system clock at start up and at fixed intervals as adjusted in the program's settings. The program is feeeware. You can read more about it and download it from Be sure to clear the check box "Synchronize with an Internet time Server" in Windows 7 Date and Time applet (Internet Time tab) when using Time-Sync.

by Al Ducote (not verified) on 3. November 2012 - 5:09  (101782)

Very nice and easy to setup and forget about. Since it is a service and thus hidden (no icon in System Tray) run the Time-Sync shortcut again to get to the Protocol (log). I set the sync to every half a minute to test then reset to 12 hours for normal use.

by Anonymous on 25. December 2009 - 12:59  (39439)

Hi Kendall,

Could you please also include limitations i.e. "Too far out of sync" and other time correction problems that these types of programs may have.

I notice one old comment about laptops and PTC batteries that has had no response to date.

I too am searching for a program that will correct time that is months, even years out of date, and that will correct the time and date on start-up.

Yep, same problem with dead PTC batteries and laziness. :-P

by Anonymous on 12. December 2009 - 17:38  (38411)

I use DS Clock, light and fast

by Anonymous on 27. September 2009 - 3:21  (33379)

Please review "About Time", it is simple, efficient and works since Windows 98:

by kendall.a on 27. September 2009 - 17:00  (33412)

Thank you. I will check it out.

by Anonymous on 21. August 2009 - 19:13  (31282)

I love Dimension4. In fact, to run it in Vista, I was forced to disable User Account Control. But I want to run it in Windows 7 but the UAC problem remains. So I will be looking at other time servers, perhaps those listed by others in your comments.

by Anonymous on 30. July 2009 - 20:19  (26036)

Take a look at Atom Time - they have been around since Windows 98

by Anonymous on 21. August 2009 - 19:19  (31283)

AtomTime also has the "Unknown Publisher" problem and UAC in Vista and Win 7 dislikes it. This is the same problem that UAC has with Dimension4.

by Anonymous on 23. July 2009 - 2:35  (25611)

I use Karen's Time Sync at

While you're there check out her many other excellent free tools.

by Anonymous on 21. August 2009 - 19:45  (31286)

Interesting program ... a bit more difficult to configure than Dimension4. While it does not have the "Unknown Publisher' problem that D4 has, it still will not automatically start at boot in Win 7.

by kendall.a on 23. July 2009 - 3:25  (25613)

Thanks, I will do that.

by Anonymous on 20. May 2009 - 15:22  (21964)
by Anonymous on 6. June 2010 - 16:31  (51492)

Hi All,

I tried Wims WClock30. The missing file was easy. I moved it from my #2 machine. Turns out that the clock was not what I really needed. Used Win XP Add/Remove. Only removed the Menu entry. The Folder was intact. Was Read only. Could not reassign or remove from Windows. Booted DOS and used Deltree to remove it. Also found registry entries and removed.

It looked good if you need it except for the above.


by Anonymous on 21. August 2009 - 19:56  (31288)

Doesn't seem to work on Win 7 ... claims that a "system file" is missing! This is probably a file not in Windows 7.

by Anonymous on 13. March 2009 - 4:04  (17728)

Symm Time is a great product. Free and up to 6 timezones simultaneously. Auto syncs to system clock to any time zone and up to 10 days differential. No year or Month auto sync tho. Customizable clocks, user scheduling updates from 1 munute to 10 days. Lots more features. New version coming in about a week or 2.

This would be perfect for 'Anonymous on Mon, 02/02/2009 - 20:02'

by Anonymous on 13. March 2009 - 3:49  (17726)

Is there a a similar simple program that automatically adjusts year, month and day, not just day and time? Good for those near impossible to get at tiny unreliable laptop PTC batteries that die when not used for long periods.

PS: Good to see sensible replies here. It's a great site.

Went to other sites and asked same Q? and they go so far off track, like, are you running 60Hz on your laptop, your PTC battery is flat (that's the actual point I, and another here, wish to work around), or, try updating your BIOS. Just need a progam please.

by Bob on 2. February 2009 - 22:36  (15171)


I notice the Thinking Man Software site says:
"Commercial users of Dimension 4 v5.0 MUST register by paying US $10 per License."

Personally I've been quite happy with Atomic Clock Sync, which is also free for commercial use.

You can schedule clock syncs from a NIST server at any interval. The programme doesn't seem to give you a choice of protocol, but it will walk you through a quick repair wizard if your computer has stopped syncing. You have to set your time zone manually, but it gives you the option of seeing two extra clocks when you mouse over or click the Window's one in the system tray.
391 KB download; no installation required.
Vista (32-bit), XP, Server 2003, 2000 [old versions available for Me, 98, 95, NT 4].


by Anonymous on 21. August 2009 - 20:24  (31289)

This may be OK, I don't know. It continuously gave me error messages when I tried to synchronize, and also when I tried to use the "repair wizard" mentioned above. AS i have also mentioned, I am running Windows 7 64 bit and that may be the problem.

I am still looking for a satisfactory time synchronizer for Windows 7 x64.

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