1. Your Windows Date/Time settings have the wrong time zone or daylight savings time setting. Click here for instructions on how to check your time zone settings. This is the most common error.
2. You live in the United States and have not installed recent daylight savings (DST) updates from Microsoft. In 2007, new daylight savings periods went into effect. Microsoft has updates available for most Windows platforms.
     Visit their web site: Daylight Savings time Help and Support Center
3. You are using a time zone that Microsoft did not implement correctly. Microsoft provides a program called TZEDIT that will allow you to edit the time zone settings. Click here or search Microsoft's web site for TZEDIT.
4. You are using a proxy server and have specified proxy port 13. This is wrong. Port 13 is the daytime port for the proxy server (which means you get the proxy server's time, not the Atomic Clock site). Correct the proxy port number.

• Right click on the AtomTime icon and select Properties. On the subsequent dialog box, click on the Compatibility tab. Finally, turn on the 'Run this program in compatibility mode for' checkbox. This is the recommended solution.
  ... Or ...
  
• Right click on the AtomTime icon and select Properties. On the subsequent dialog box, click on the Compatibility tab, and then turn on the 'Run this program as an administrator' checkbox. View screenshot. You only need to make this change once.
  ... Or ...
  
• Alternatively, you can right click on the AtomTime icon and select 'Run as Administrator' each time. You'll need to do this each time you want to adjust the clock.

1. If using a program like ZoneAlarm, check that software and have it allow AtomTime connections.
2. Fill in the Proxy Server settings in AtomTime. Your network adminstrator should be able to help here, otherwise look in your web browser settings for the correct proxy server settings, specifically the settings for HTTP.
3. If you use Internet Explorer (not Netscape, it won't work for this test), try this exact URL:   http://time-a.nist.gov:13/
   It should return a timestamp. If it does not, talk to your network adminstrator and show them that URL. Explain that you'd like TCP port 13 opened so that the time value can be retrieved.
4. Try defining your own set of time servers, using port 37 as the time port.

1. Use an add-on utility to run AtomTime as a service program. Microsoft offers a free one called ANYSRV, and a number of users have found the freeware FireDaemon to be a better solution than Microsofts. FireDaemon can be found at:
     http://www.firedaemon.com
   We've tested with FireDaemon and find it easy to install and use. Follow the instructions with the service program to configure AtomTime as a service. However, do NOT start the AtomTime service yet. Once you've installed AtomTime as a service program, you'll need to change a few settings.
2. Start AtomTime from the Start menu and change the Update Interval to some hourly value, and configure any other options you may need. Run it once to make sure it works OK. If you need assistance on the AtomTime options, please look over the AtomTime manual (found on your Start menu, in the AtomTime folder).
3. Finally, in the Services control panel, change the startup options for the AtomTime service you installed in step 1. In particular, change the service startup options to be Log On As 'This Account' and then make sure you specify Administrator and the password. This will launch the service program under the administrator profile (but doesn't require that you sign in as administrator). Note: This assumes you've installed AtomTime under the Administrator account. If you didn't, then change the startup options for the service to use the account that you installed under. And also make sure that account has authority to change the system clock.

Please note that if you need to change an AtomTime setting, make sure you stop the atomtime service first.