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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.

In a Hurry?

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 Anonymous on 14. May 2008 - 17:51  (486)

SymmTime not only does time sync but also has world clocks - it rocks!

by Anonymous on 11. June 2008 - 9:02  (1927)

Neutron - Small, fast and gets the job done!

by MikeRoberts on 31. July 2008 - 1:47  (5227)

I've depended upon this super easy to use time server: nistime-32bit.
TCP/Daytime Client Program
Company: Natl. Inst. of Stand. and Tech. File ver: 1.0.0
Size 260KB
Http:// (nice add-ons as well)

by Anonymous on 12. August 2008 - 15:05  (5965)

W32Time has been an integrated service since Microsoft Windows 2000. It can be more completely configured via the registry.

by Anonymous on 28. September 2008 - 10:05  (8404)

TimeSync 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 user's regional settings.

TimeSync will try alternative servers, in case the time cannot be obtained from the preferred server.

Option /auto is provided to run TimeSync from the StartUp folder. In this mode the TimeSync window will not show if the clock offset is under a given minimum.

Excellent! from Horst Schaeffer's windows freeware:

by Anonymous on 2. February 2009 - 20:02  (15157)

I travel a lot. Do any of these time synch programs (or does anyone know of a program which would) correct the time zone (or notify you that your timezone might have changed) based on IP geo-location?

For my needs, my laptop's RTC does a good enough job of keeping track of seconds elapsed, but when I change time zones, the time is (of course) "incorrect".


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 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 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 20. May 2009 - 15:22  (21964)
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 kendall.a on 23. July 2009 - 3:25  (25613)

Thanks, I will do that.

by Anonymous on 23. July 2009 - 20:18  (25669)

Ditto - that's the one I've used for a number of years now. Simple, compact and it does the job.

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 30. July 2009 - 23:28  (26051)

Not based on geolocation and you can't trust that anyway, but I travel a lot too and the easiest solution I have come up with is a bit different. If you're working for an airline you probably regularly return to several of the same time zones, so...

For instantly changing the time zones, get Karen's Zone Manager, available at It allows you to create desktop shortcuts to frequently used time zones. Click on the shortcut, and it instantly and correctly converts the time and changes the computer's time zone to another zone. IE, if I switch right now, my current time zone which is UTC + 10 in Eastern Australia (std time now), my system tray clock immediately goes from 212 Fri 31 Jul 2009 09:05:37 AUS Eastern Standard Time to the central USA's current time which is 211 Thu 30 Jul 2009 18:05:55 Central Daylight Time. No need to go into settings to move the time forward or backward.

The custom system tray clock is TClockEx, the original version, which is the only version I've tried which can be set to display the name of the current time zone. It is available at

For synchronizing with an ntp server, I use Neutron, available at The beauty of neutron is it can be set to exit itself automatically once time is set.

"Geolocation" may be nice in major cities in North America or Europe but it is completely worthless in remote areas, go to motels all over the world and hook into their wireless network then look up the ip address of your own computer. In several places I've been, including Longreach, QLD, and Alice Springs, it usually says I'm in Washington DC.

Also if you have to regularly read weather reports or other items with UTC timestamps, you can use the zone manager to create a UTC zone and link to it, like this: 211 Thu 30 Jul 2009 23:16:41 UTC Standard Time


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 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 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 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 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.

by Anonymous on 21. August 2009 - 20:39  (31290)

Time Sync is very nice and seems to work well with Windows 7 x64, but it does not do it's job "quietly", that is, it must be open on the screen the user must manually request the synchronization. I am looking for a silent application, one that synchronizes automatically, and then sleeps until the next synchronization is required.

D4, your suggested application does this, but has the User Account Control problem.

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 12. December 2009 - 17:38  (38411)

I use DS Clock, light and fast

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 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 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 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 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