If you use the TZ environment variable in Microsoft Visual Studio 2005 Service Pack 1, the following C runtime (CRT) functions do not recognize daylight saving time (DST) correctly:
localtime
localtime_s
_localtime32
_localtime32_s
_localtime64
_localtime64_s
These functions recognize DST as starting on the first Sunday of April and ending on the last Sunday of October for all dates. These functions do not recognize DST as starting on the second Sunday of March and ending on the first Sunday of November according to the U.S. Energy Policy Act of 2005.
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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
To download this hotfix from the MSDN Code Gallery, visit the following Microsoft Web site:
Note The MSDN Code Gallery displays the languages for which the hotfix is available. If you do not see your language listed, it is because the Code Gallery resource page is not available for that language.
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 Web site:
You must have Visual Studio 2005 Service Pack 1 installed before you apply this hotfix.
Restart requirement
You do not have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
When you use the TZ environment variable, this hotfix changes DST to start on the second Sunday of March and end on the first Sunday of November for dates in 2007 and in later years. For 2006 and for earlier years, DST starts on the first Sunday of April and ends on the last Sunday of October.
Note This hotfix only applies to applications that set the TZ environment variable.
For more information about the TZ environment variable, visit the following Microsoft Developer Network (MSDN) Web site:
The following CRT and Microsoft Foundation Classes (MFC) functions call the localtime function and the _localtime64 function. These functions may also be affected by this change.
ctime
_wctime
_tctime
_ctime64
_wctime64
_tctime64
mktime
_mktime64
_utime
_wutime
_tutime
_utime64
_wutime64
_tutime64
COleDateTime::operator=
CTime::GetLocalTm
CTime::Format
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684
(http://support.microsoft.com/kb/824684/
)
Description of the standard terminology that is used to describe Microsoft software updates
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