Chile DST 2013 Fallback

Disclaimer:  The information in this document is written in response to an announcement by the government of Chile about changes in the daylight saving time in Chile for the year of 2013.

The steps provided in this bulletin were created to mitigate the impacts that the daylight saving time changes will cause for customers in Chile. These are the impacts primarily anticipated at the time this document was written, and the effects that customers may face are not restricted to them.

The suggested actions on this document might receive additional testing. The information described in this document may change without notice.

In addition, customers should be aware that further guidance may be provided at any time by Microsoft.

Special notes: The official decree changing the DST dates in Chile is published by the government on the following site:


Chile DST 2013 Fallback

In 2011 the Chilean government implemented a pilot plan to extend the DST period in Chile. During last year the government evaluated the energy saving, public security and more modern public policies. The studies and consultations carried out by the government resulted in preliminary findings to justify maintaining the measure for the year 2013.

The Chilean government announced that for the 2013 will continue implementing a schedule of reduced winter, privileging the DST. The new DST definition is the following:

For mainland and Chilean Antarctica the Daylight saving time ends: 23:59:59 of April 27th, 2013 the clocks should go back to 23:00 of the same day.

For Easter island + Salas y Gómez islands the Daylight saving time ends: 21:59:59 of April 27th, 2013 the clocks should go back to 21:00 of the same day.

For the mainland the Daylight saving time starts: 23:59:59 of September 7th, 2013 the clocks should go forward to 1:00 of the next day.

For Easter island + Salas y Gómez islands the Daylight saving time starts: 21:59:59 of September 7th, 2013 the clocks should go forward to 23:00 of the same day.

Since the new date published by the government is different from what was defined in the previous years, Windows-based computers will not correctly interpret the time that is related to the transition to daylight savings time.

In addition to Microsoft products, other software, OS releases and hardware (phones, routers, switches and managed devices) may require updates and/or changes.

Our teams at Microsoft have taken several steps to alert customers and partners about the changes in Chile.

At this moment Microsoft is working on a hotfix to update the Windows Operating Systems with the new fallback DST date for Chile, however, we have no defined a date for release of this hotfix.

Users that apply the upcoming hotfix will be prepared for the changes. However all the users will have to adjust the Outlook calendars after any changes related with time zone (hotfix or workaround).

We will continue to publish advice and recommendations on the LATAM Team Blog at and at

General recommendations

  • Install the new hotfix as soon as it is available.
  • Please note that if you adjust the machine’s clock manually, you may have adverse effects on your environment. This procedure is not supported by Microsoft.
  • Contact Microsoft Support prior to any modification if you are unsure about the steps to follow in order to be prepared for the Daylight Saving Time change in Chile.
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