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I'm using Windows 7. Or does Windows 7 already have that ability built-in?

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up vote 15 down vote accepted

The Time service has existed in Windows since Windows 2000, and has synced over the internet since XP. You can change the server if you're not happy with it's performance as detailed here, but the default always serves me well.

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Specifically, the Windows Time Service was introduced in Windows 2000. However, the Windows 2000 Time Service was, by default, only configured to synchronize time between workstations and domain controllers. Windows XP was the first version that came pre-configured to use an external time server. –  davidcl Oct 31 '09 at 13:23
    
Ah, thanks. I wanted to say since 2000, but wasn't sure if I was right :) –  Phoshi Oct 31 '09 at 13:25
    
The default server hasn't ever worked once for me in the ~10 years that I've known of it. Maybe it's a European thing... –  romkyns May 23 '11 at 17:09
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It IS built in, and on by default.

Click on the time, click on "Change date and time settings..", and see the "Internet Time" tab.

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I use Atomic Clock Sync for my home PCs, though I really should just use the built in service as it would be one less thing to load on start up

Though I've just tried using the built in one on Windows-XP and I get an error - "An error occurred while Windows was synchronizing with [name of time server]." - for any time server I try. I asked a question and got an answer which solved the problem.

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I actually went through this two days ago. Noticed my XP main machine was drifting a tad time-wise. I had used Peyo's Atomic Clock Synchronizer before and noticed it was still out there and working with XP. So I downloaded it from http://www.peyo-home.sk/atomclock/index.htm. Just works, although it has two quirks. The help button does not show any About information and certainly doesn't give a link back to peyo's site. And the exit button actually exits, rather than closing the interface and minimizing back to the system tray, as some of the other syncing programs do. Otherwise, it just seems to work on a schedule you set.

And like others, I have had issues with the Time Service in the past, thus the desire to find a good third party solution.

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