The Microsoft Support Lifecycle team gets lots of questions about Extended Hotfix Support for Daylight Saving Time (EHS for DST).  Although this offering was initiated in 2007, there still seems to be some confusion around its purpose and how to obtain it.

In an earlier post we talked about Extended Hotfix Support and its purpose: a program that provides customers with the ability to request non-security hotfixes for products in the Extended Support phase of the lifecycle. EHS for DST is slightly different, but related.

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What is the history behind Extended Hotfix Support for Daylight Saving Time? Daylight Saving time (DST), and “Summer Time” in much of Europe, is the practice of moving local time forward one hour in the spring and backwards in the autumn. These spring and fall shifts to DST are different between northern and southern hemispheres. The start of DST in the northern hemisphere is in March or April (depending on the country/continent), and ending in October or November. In the southern hemisphere, the changes are the opposite, with DST beginning in October and ending in March or April. Generally, DST is not observed in Asia and Africa, and parts of Central and South America. Unless certain updates are applied to your computer, the time zone settings for your computer’s system clock may be incorrect during this four-week period. In particular, you must make sure that both your Windows operating system and your calendar programs are updated.

Daylight Saving Time hotfixes can be applied to your computer to correct the time zone settings that get “out of synch” because of the DST time changes; and are available for products in the Mainstream phase of the lifecycle free of charge.  To obtain DST hotfixes for products in the Extended Support phase, customers must purchase Extended Hotfix Support for Daylight Saving Time. EHS for DST entitles them to receive daylight saving time hotfixes for all affected products in the Extended Support phase.  The cost is $4,000 USD and the program is open to all Microsoft customers. A list of affected products is available here.


When will my Extended Hotfix Support for DST contract expire?

All EHS DST support contracts expire on the 31st of December of the calendar year, so any contract signed during 2008 will expire on December 31, 2008.

After I enroll, how do I get the hotfixes?

Once you enroll you will receive access to the Microsoft Connect web site where you can download the appropriate updates.

My company purchased a Extended Hotfix Support for DST contract in October 2007. I thought the contract was good for 12 months. Do I have to purchase another contract to receive 2008 DST updates?

Your contract ended on December 31, 2007.  EHS for DST contracts signed on or after January 1, 2008 will end on the 31st  of December of the calendar year in which the contract commences; so you must purchase another contract for 2008.

Additional information can be found here:

* Daylight Savings Time Help and Support Center
* Obtaining Daylight Savings Time Updates for Microsoft Products
* Microsoft Daylight Savings Time and Timezone FAQs Blog

Let us know if the explanation above helped you better understand Daylight Saving Time Extended Hotfix Support!

*This posting is provided “AS IS” with no warranties, and confers no rights.*