2007 Time Zone Update For Microsoft Windows Operating Systems

I am sure that everyone is aware that in 2005 the US Congress had passed, The Energy Policy Act, with one of the provisions being that Daylight Savings Time would start 3 weeks earlier and end one week later. And that this new law would take effect starting in 2007. In essence, the new DST will start on the second Sunday in March and end on the first Sunday in November. Both go into effect at 2:00am on both dates.

Microsoft has a site where updates are available for most Windows operating systems, to correct the new the system time and date to auto apply the daylight savings start and end dates. And I would venture a guess that these updates may also be applied in some future Windows update process.

And there are some additional updates for Australia, Cairo and Sri Lanka.

Microsoft Site – DST Changes

You mean you weren’t aware of the change is Daylights Savings Time starting this year? Thus far I haven’t talked to anyone who was aware of this. Including myself. LOL

[tags]microsoft, windows, time, daylight savings, changes, [/tags]

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I have been writing for Lockergnome for eight years.


  1. We know all about the new daylight savings time arrangements up here in Canada. In fact, it’s been the source of quite a lot of controversy with many people saying that the Americans are trying to push us around again and force us to change our DST in a way that doesn’t benefit more northerly lattitudes. My opinion is, it’s just a couple of weeks difference at the start and end. I never realized though, that my computer would have to be updated. Thanks for the tip. I suppose they’ll have an update that works for W98, even if regular support is over.

  2. Ron Schenone says:

    Hi Tim,
    I think you can just manually adjust your time as well, even without a MS update.

    And with 98 still in use, I wouldn’t doubt if someone outside of MS may address this as well. Like they did with the ‘unofficial’ SP1 updates for Win 98.

  3. Harlan Wise says:

    Where are the unoffical sp1 updates? I have 23 units still running 98.

  4. Ron Schenone says:

    Hi Harlan,
    Here you go:

    I hope this is what you were looking for. Ron

  5. Patrick M Duffy says:

    Here’s a link to instructions and a regedit file for the full time zone update issued by Microsoft but modified to work with Windows 98. http://www.besteam.ca/info/win98/Time_Zone_Fix.htm I have included installation instructions.

  6. Ron Schenone says:

    Hello Patrick M Duffy,
    Thanks for the information and the link.

  7. Jerry Wines says:

    Mr. Duffy’s registry file has one big problem, one small problem, and several errors
    The big problem:
    The first line in the file after REGEDIT4 “[-HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Time Zones]” needs to be removed. That line will delete ALL current Time Zone information. The file will then add the information for Time Zones that have changed, but you will have LOST all info for time zones that did not change, such as Arizona, Hawaii, Indiana, Samoa, and Azores just to name a few — all you will have are Time Zones that have changed, none of the original ones that did not change.

    The small problem (though this could be a “feature”):
    The next two lines “[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Time Zones]
    @=”Mountain Standard Time” also need to be removed, as they will set the default Time Zone to Mountain Standard Time. However, if your time zone is NOT Mountain, this would mean you only have to change the time zone back to yours finish the update instead of changing it to something different and then changing it back.

    The errors:
    The data in the following keys does not match the latest data posted by Microsoft. They may have updated/corrected it after Mr. Duffy set up his file.
    Keys with Errors:
    Central Brazilian Standard Time
    Central Brazilian Standard Time\Dynamic DST
    E. South America Standard Time
    Iran Standard Time (missing)
    Iran Standard Time\Dynamic DST (missing)
    Newfoundland Standard Time\Dynamic DST
    W. Australia Standard Time
    W. Australia Standard Time\Dynamic DST
    For example, the W. Australia Standard Time data is for 2006, not 2007.

    The only difference between Win98 and the newer versions of Windows is the key name and file version. If you follow the instructions for creating the reg file per this article http://support.microsoft.com/kb/914387 and then replace all occurrences of “Windows NT” with “Windows”, and change the first line in the reg file from “Windows Registry Editor Version 5.00″ to “REGEDIT4″, the file will work on Win98 and have the most current info from Microsoft. I have not tried running the vbs script so I don’t know if it will work on Win98. I would just change the time zone and change it back as Mr. Duffy shows.


  8. Jerry Wines says:

    Ok, my turn to make an error. The latest info for the tzupdate.reg file in the Microsoft article I mentioned above now contains all of the time zones, not not just the updated ones. However, they have changed the names slightly, for example “Pacific” is now “Pacific Standard Time”. If you create the file as I suggested and merge it, you will have duplicates. You could delete the current values first by using the first line in Mr. Duffy’s file, the one that has the minus sign right in front of HKEY. However, if there is any software that searches the registry for time zone info, and uses the old names ( I don’t know if there is or not), may not work properly. And if you edit the file to use the old names, software looking for the new names may fail.

    Might have to create a file that updates the old data, and also adds the new — There will be duplicates when you go to set the time zone, but this might be the best option for compatibility.

    Anyone have any ideas/comments/suggestions?

  9. Ron Schenone says:

    Hi Jerry,
    Thanks for the info.