How to change the daylight-saving time program for the new 2004 to 2005 schedule in the Uruguay time zone

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Article ID: 886775 - View products that this article applies to.

Daylight saving time update

To obtain the most recent information about daylight saving time (DST), click the following article number to view the article in the Microsoft Knowledge Base:
955839 December 2008 cumulative time zone update for Microsoft Windows operating systems
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INTRODUCTION

The country of Uruguay has scheduled a modified daylight-saving time program for 2004 and 2005. This modified daylight-saving time program is different from the daylight-saving time program that applies to the default time zone that is used for Uruguay in Microsoft Windows operating systems. The default time zone for Uruguay is Brasilia -3:00. The daylight-saving time program for the Brasilia -3:00 time zone is:
  • Daylight-saving time starts at 2:00 A.M. on the third Sunday of October 2004. The third Sunday of October 2004 is October 17, 2004.
  • Daylight-saving time ends at 2:00 A.M. on the second Sunday of February 2005. The second Sunday of February 2005 is February 8, 2005.
The new daylight-saving time program in Uruguay is:
  • daylight-saving time starts at 2:00 A.M. on the third Sunday of September 2004. The third Sunday of September 2004 is September 19, 2004.
  • daylight-saving time ends at 2:00 A.M. on the second Sunday of March 2005. The second Sunday of March 2005 is March 13, 2005.
Because this is a new daylight-saving time program in Uruguay, computers that are running a Microsoft Windows operating system do not adjust the time zone to reflect the change to daylight-saving time. This step-by-step article describes how to change the default behavior of the Uruguay time zone.

MORE INFORMATION

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.

Method 1: Use the Tzedit.exe utility to manually modify the time zone

Use the Tzedit.exe utility to adjust the start and the end dates for daylight-saving time in the Uruguay time zone. The Tzedit.exe utility is available on any Microsoft Windows Resource Kit. To use this method, you must obtain the Tzedit.exe utility from the resource kit for your version of Windows. For more information about the Windows resource kits, visit the Microsoft Windows Deployment and Resource Kits Web site:
http://technet.microsoft.com/en-us/windowsserver/bb693323.aspx
To adjust the start and the end dates for daylight-saving time in the Uruguay time zone, follow these steps:
  1. Click Start, point to Programs, point to Windows Resource Kit, and then click Tools.
  2. Double-click Alphabetical list of Tools, and then click Time Zone Editor.
  3. Click New, and then type (GMT-03:00) Montevideo in the Time Zone Name box.
  4. In the Abbreviation box, type Montevideo Uruguay.
  5. In the Offset from GMT box, type -3:00.
  6. Click to select the Automatically set daylight-saving time check box.
  7. Follow these steps:
    1. In the first Start Day box, click Third.
    2. In the second Start Day box, click Sunday.
    3. In the third Start Day box, click September.
    4. In the fourth Start Day box, click 2:00 AM.
    5. In the first Last Day box, click Second.
    6. In the second Last Day box, click Sunday.
    7. In the third Last Day box, click March.
    8. In the fourth Last Day box, click 2:00 AM.
    9. In the Abbreviation box, type Horario de Verano.
    10. In the Daylight Bias box, click +1:00 to set the clock forward 1 hour. By default, Daylight Bias is set to +1:00.
  8. Click OK, and then quit Windows Time Zone Editor.
  9. Click Start, point to Settings, and then click Control Panel.
  10. Double-click Date/Time, and then click the Time Zone tab.
  11. Click (GMT -3:00) Montevideo, and then click OK.
  12. Click to select the Automatically adjust clock for daylight saving changes check box, click Apply, and then click OK.
  13. To test that the new time zone setting will adjust for daylight savings as expected, change the time and date on your computer to several minutes before the time that you have set for the daylight-saving time changes. Verify that the daylight-saving time changes are correct when the change occurs.

Method 2: Run Timezones.reg and Tzinfo.reg files to change the daylight-saving time on another computer

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows


Follow the steps in the "Method 1: Use the Tzedit.exe utility to manually modify the time zone" section to modify the daylight-saving time start and end dates for the Montevideo time zone. After you have completed Method 1 on one computer, you can use the Timezones.reg and Tzinfo.reg files to change the time zone on another computer. To do this, follow the steps for your operating system.

Microsoft Windows XP, Microsoft Windows 2000, Microsoft Windows Server 2003, or Microsoft Windows NT

  1. On the computer where you have changed the time zone by using Method 1, click Start, click Run, type regedit, and then click OK.
  2. Expand the following registry subkey:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones
  3. Click Montevideo Uruguay, and then click Export Registry File on the Registry menu.
  4. In the Save in box, click Desktop, type timezones in the File name box, and then click Save.
  5. Expand the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation
  6. Click TimeZoneInformation, and then click Export Registry File on the Registry menu.
  7. In the Save in box, click Desktop, type tzinfo in the File name box, and then click Save.
  8. Quit Registry Editor.
  9. Copy the Timezones.reg and Tzinfo.reg files that you created in step 4 and in step 7.
  10. Put the files that you copied on to the computer whose time zone settings you want to update with the new daylight-saving time dates. This computer is known as the destination computer.
  11. On the destination computer, double-click the Timezones.reg file.
  12. Click Yes when you are prompted to add information to the registry.
  13. Click OK when you receive the message that the information was successfully entered in the registry.
  14. On the destination computer, double-click the Tzinfo.reg file.
  15. Click Yes when you are prompted to add information to the registry.
  16. Click OK when you receive the message that the information was successfully entered in the registry.
  17. Restart the computer.

Microsoft Windows 95, Microsoft Windows 98, Microsoft Windows 98 Second Edition, or Microsoft Windows Millennium Edition

  1. On the computer where you have changed the time zone by using Method 1, click Start, click Run, type regedit, and then click OK.
  2. Expand the following registry subkey:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Time Zones
  3. Click Montevideo Uruguay, and then click Export Registry File on the Registry menu.
  4. In the Save in box, click Desktop, type timezones in the File name box, and then click Save.
  5. Expand the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation
  6. Click TimeZoneInformation, and then click Export Registry File on the Registry menu.
  7. In the Save in box, click Desktop, type tzinfo in the File name box, and then click Save.
  8. Quit Registry Editor.
  9. Copy the Timezones.reg and Tzinfo.reg files that you created in step 4 and in step 7.
  10. Put the files that you copied on to the computer whose time zone settings you want to update with the new daylight-saving time dates. This computer is known as the destination computer.
  11. On the destination computer, double-click the Timezones.reg file.
  12. Click Yes when you are prompted to add information to the registry.
  13. Click OK when you receive the message that the information was successfully entered in the registry.
  14. On the destination computer, double-click the Tzinfo.reg file.
  15. Click Yes when you are prompted to add information to the registry.
  16. Click OK when you receive the message that the information was successfully entered in the registry.
  17. Restart the computer.

Example of the Timezones.reg file

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Montevideo Uruguay]
"Display"="(GMT-03:00) Montevideo"
"Dlt"="Horario de Verano"
"Index"=dword:00000047
"TZI"=hex:b4,00,00,00,00,00,00,00,c4,ff,ff,ff,00,00,03,00,00,00,02,00,02,00,00,\
  00,00,00,00,00,00,00,09,00,00,00,03,00,02,00,00,00,00,00,00,00

Example of the Tzinfo.reg file

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
"Bias"=dword:000000b4
"StandardName"="Montevideo Uruguay"
"StandardBias"=dword:00000000
"StandardStart"=hex:00,00,03,00,02,00,02,00,00,00,00,00,00,00,00,00
"DaylightName"="Montevideo Uruguay"
"DaylightBias"=dword:00000000
"DaylightStart"=hex:00,00,03,00,02,00,02,00,00,00,00,00,00,00,00,00
"ActiveTimeBias"=dword:000000b4
"DisableAutoDaylightTimeSet"=dword:00000001

REFERENCES

For additional information about how to use the Tzedit.exe utility, click the following article number to view the article in the Microsoft Knowledge Base:
158195 Time Zone Editor available on OEM Service Release 2 CD-ROM

Properties

Article ID: 886775 - Last Review: February 24, 2009 - Revision: 3.0
APPLIES TO
  • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
  • Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 4.0 Standard Edition
  • Microsoft Windows NT Server 4.0 Enterprise Edition
  • Microsoft Windows Millennium Edition
  • Microsoft Windows 98 Second Edition
  • Microsoft Windows 98 Standard Edition
  • Microsoft Windows 95
Keywords: 
kbhowto kbdatetime kbinfo KB886775

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