Microsoft KB Archive/918645

= How to configure the daylight saving time start date and end date for Guatemala in Windows =

Article ID: 918645

Article Last Modified on 10/11/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
 * Microsoft Windows Server 2003 R2 Enterprise Edition (32-Bit x86)
 * Microsoft Windows Server 2003 R2 Enterprise x64 Edition
 * Microsoft Windows Server 2003 R2 Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003 R2 Standard x64 Edition
 * Microsoft Windows Server 2003, Enterprise Edition
 * Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
 * Microsoft Windows Server 2003, Enterprise x64 Edition
 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Standard x64 Edition
 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Server

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Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



Disclaimer The information in this article is written in response to an announcement by the government of Guatemala about the implementation of daylight saving time in Guatemala for 2006. At the time of this writing, the government of Guatemala has not indicated whether it will continue to use daylight saving time after 2006. Therefore, we recommend that if you decide to modify the computer's registry to update the Time Zone setting, you fully test the solution in a laboratory environment before you deploy this change in a production environment.



SUMMARY
''The government of Guatemala has announced the implementation of daylight saving time in Guatemala. Currently, Guatemala uses the (GMT-06:00) Central America time zone. This article contains instructions about how to modify the default behavior of the start date and end date for daylight saving time in this time zone. By following these instructions, you will enable the daylight saving time start date and end date that is implemented in Guatemala.''



INTRODUCTION
This article describes how to change the daylight saving time start date and end date for the (GMT-06:00) Central America Time Zone setting in Microsoft Windows to reflect the daylight saving time start date and end date in Guatemala.



MORE INFORMATION
The government of Guatemala has announced the following start date and end date for daylight saving time in Guatemala:
 * Daylight saving time starts on Sunday, April 30, 2006, at 12:00 midnight local standard time.
 * Daylight saving time ends on Sunday, October 01, 2006, at 12:00 midnight local daylight saving time.

Currently, computers in Guatemala use the (GMT-06:00) Central America time zone setting. However, the default values for the (GMT-06:00) Central America time zone setting in Microsoft Windows do not correctly reflect this daylight saving time start date and end date. Therefore, for computers in Guatemala, you must modify the Windows (GMT-06:00) Central America time zone setting to make sure that the computer's clock is correctly updated when daylight saving time starts and ends in Guatemala.

For more information about the 2006 daylight saving time start dates and end dates in Guatemala, visit the following Time and Date AS Web site:

http://www.timeanddate.com/worldclock/city.html?n=94

Use one of the following methods to modify the default behavior of the (GMT-06:00) Central America time zone setting in Windows to correctly reflect the Guatemalan daylight saving time start date and end date.

Method 1: For home computer users
If you are a home computer user, or if you only have several personal computers, you can manually modify the time zone setting to reflect the Guatemala daylight saving time start date and end date. To do this, follow these steps.Note Because there are several versions of Microsoft Windows, the following steps may be different on your computer. If they are, see your product documentation to complete these steps.

On April 30, 2006

 * 1) Click Start, click Run, type timedate.cpl in the Open box, and then click OK.
 * 2) Click the Time Zone tab, click (GMT-05:00) Bogota, Lima, Quito in the Time Zone list, and then click OK.

On October 1, 2006

 * 1) Click Start, click Run, type timedate.cpl in the Open box, and then click OK.
 * 2) Click the Time Zone tab, click (GMT-06:00) Central America in the Time Zone list, and then click OK.

Method 2: For corporate computer users
If you are a computer user for whom the following conditions are true, we recommend that you follow the steps in the &quot;Method 1: For home computer users&quot; section to manually modify your time zone settings:
 * You require calendar synchronization with users who are located outside Guatemala.
 * You have recurring meetings with users who are located outside Guatemala.

Method 1 will help keep your meetings and calendar synchronized with users who are located outside Guatemala.

Note As a best practice, we recommend that administrators encourage users to create a printed copy of their calendar information before they modify time zone settings.

The Windows Time Zone Editor tool (Tzedit.exe)
For corporate users and industry personal computer users who do not require calendar synchronization with users who are located outside Guatemala, we recommend the Windows Time Zone Editor (Tzedit.exe) tool to modify the daylight saving time start date and daylight saving time end date in your time zone. The Windows Time Zone Editor tool is included in the Windows 2000 Server Resource Kit Tools.

To modify the time zone settings by using this tool, follow these steps.

Step 1: Configure the daylight saving time start date and end date

Use the Windows Time Zone Editor tool to modify the time zone settings on one computer or on several computers. To do this, follow these steps:
 * 1) On a computer that has the Windows 2000 Server Resource Kit Tools installed, click Start, click Run, type tzedit in the Open box, and then click OK.
 * 2) In the Windows Time Zone Editor dialog box, click (GMT-06:00) Central America in the Time Zones list, and then click Edit.
 * 3) In the Edit Time Zone dialog box, click to select the Automatically set Daylight Saving Time check box.
 * 4) In the Start Day box, click Last, click Sunday, and then click April.
 * 5) Leave the default time setting of 12:00:00 AM selected.
 * 6) In the Last Day box, click First, click Sunday, and then click October.
 * 7) Leave the default time setting of 12:00:00 AM selected.
 * 8) In the Daylight Bias box, leave the default setting of +1:00 selected to force the computer clock to move forward by one hour during daylight saving time.
 * 9) Click OK, and then click Close to close the Windows Time Zone Editor tool.
 * 10) Click Start, click Run, type timedate.cpl in the Open box, and then click OK.
 * 11) Click the Time Zone tab, click a time zone other than (GMT-06:00) Central America in the Time Zone list, and then click Apply.
 * 12) In the Time Zone list, click (GMT-06:00) Central America, and then click OK.

Note You must perform steps 11 and 12 to force the new time zone settings to take effect.

Step 2: Export the time zone registry settings to other computersWarning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk. If you have to modify the time zone settings on many computers, export the registry information from the computer that you modified in the &quot;Step 1: Configure the daylight saving time start date and end date&quot; section. You can then use the .reg file that you exported to update the time zone information on other computers. To do this, follow these steps.

Note Before you deploy the time zone registry information to other computers in your organization, we recommend that you verify whether the time is updated correctly on the computer that you modified in the &quot;Step 1: Configure the daylight saving time start date and end date&quot; section.  On the computer on which you modified the time zone information in the &quot;Step 1: Configure the daylight saving time start date and end date&quot; section, click Start, click Run, type regedit, and then click OK. In Registry Editor, follow these steps, depending on the operating system that you are running:  If you are running Microsoft Windows XP, Microsoft Windows 2000, or Microsoft Windows Server 2003, locate and then click the following registry key:

 If you are running Microsoft Windows 98, Windows 98 Second Edition, or Microsoft Windows Millennium Edition (Me), locate and then click the following registry subkey:

  On the Registry menu, click Export Registry File. Or, on the File menu, click Export.</li> In the Export Registry File dialog box, click the folder to which you want to export the .reg file, type timezones in the File name box, and then click Save.</li> Locate and then click the following registry key:

</li> On the Registry menu, click Export Registry File. Or, on the File menu, click Export.</li> In the Export Registry File dialog box, click the folder to which you want to export the .reg file, type tzinfo in the File name box, and then click Save.</li> Exit Registry Editor.</li> Copy the Timezones.reg and Tzinfo.reg files that you created in step 4 and step 7 to the computers on which you want to update the time zone settings.</li> On each destination computer, run the Timezones.reg and Tzinfo.reg files to enter the time zone information into the registry.</li> After the registry information has been successfully entered in the registry of each destination computer, restart each destination computer.</li></ol>

The Daylight Saving Time Update Utility (Timezone.exe)
The Daylight Saving Time Update Utility is included with the Windows Resource Kit Tools for the particular version of Windows that you are running. To obtain the Microsoft Windows Server 2003 Resource Kit Tools, visit the following Microsoft Web site:

http://www.microsoft.com/downloads/details.aspx?FamilyID=9d467a69-57ff-4ae7-96ee-b18c4790cffd&displaylang=en

The Daylight Saving Time Update Utility is a command-line tool that you can use to update the daylight saving time start date and end date for the current time zone in the registry.

Note This tool updates daylight saving time information only for the current time zone. This time zone information is stored in the following registry subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation

This tool does not change the default definition of the time zone that is stored in the following registry subkeys:  In Windows XP, Windows 2000, or Windows Server 2003:

</li> In Windows 98, Windows 98 Second Edition, or Windows Millennium Edition:

</li></ul>

Therefore, if you change the time zone by using the Date and Time item in Control Panel at some later date, the daylight saving time start and end dates for the time zone that you modified are reset to the default values.

For more information about how to run the Daylight Saving Time Update Utility, see the Timezone.exe topic in Windows Resource Kit Tools Help. To view this topic on a Windows Server 2003-based computer on which the Resource Kits Tools are installed, follow these steps:
 * 1) Click Start, point to All Programs, point to Windows Resource Kit Tools, and then click Windows Resource Kit Tools Help.
 * 2) In the Help and Support Center dialog box that appears, expand Windows Resource Kit Tools, expand Alphabetical List of Tools, and then click Timezone.exe: Daylight Saving Time Update Utility.

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