Daylight saving time changes for Chile and Mexico in Windows

Van toepassing: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 R2 Essentials

This hotfix has been superseded by the following hotfix:


This article describes a hotfix that updates daylight saving time (DST) settings for Chile and Mexico. Before you install this hotfix, check the Prerequisites section in this article.



Chile announced a DST change on January 28, 2015. For 2015 and going forward, Chile will remain in DST. (No DST change will be observed.) Therefore, the UTC offset for Chile will be updated to UTC-3:00, and the display name of the "Pacific SA Standard Time" time zone will be updated to "(UTC-3:00) Santiago."


The Mexican state of Quintana Roo is moving from UTC-6:00 to UTC-5:00. The "Eastern Standard Time (Mexico)" will be created, and this new time zone will have a display name of "(UTC-5:00) Chetumal". This time zone will observe the following DST rules:
  • Start date: The first Sunday of April at 02:00 (clocks move forward by one hour)
  • End date: The last Sunday of October at 02:00 (clocks move backward by one hour)
Time zone key nameDisplay nameDST startDST end
Eastern Standard Time (Mexico)(UTC-5:00) ChetumalFirst Sunday of April at 02:00:00.000Last Sunday of October at 02:00:00.000

Hotfix information

This hotfix applies to the following operating systems:
  • Windows Server 2012 R2
  • Windows 8.1
  • Windows RT 8.1
  • Windows Server 2012
  • Windows 8
  • Windows RT
  • Windows Server 2008 R2 Service Pack 1 (SP1)
  • Windows 7 SP1
  • Windows Server 2008 Service Pack 2 (SP2)
  • Windows Vista SP2
  • Windows Server 2003 SP2
  • Windows XP Embedded

How to obtain this hotfix

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, you must have the following update rollup or service pack installed for the indicated systems. There are no prerequisites to apply the hotfix to systems that are not listed here.
Windows 8.1 or Windows Server 2012 R2
Windows 7 or Windows Server 2008 R2
Windows Vista or Windows Server 2008
Windows Server 2003

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.