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Time stamp changes with daylight savings

Support for Windows Server 2003 ended on July 14, 2015

Microsoft ended support for Windows Server 2003 on July 14, 2015. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article was previously published under Q129574
When Windows NT automatically adjusts for daylight saving time, the timeson files on Windows NT file system (NTFS) partitions and the events in theevent logs are retroactively shifted by one hour, even though the filesand event records were created before the daylight saving time change.

NOTE: To configure Windows NT to automatically adjust for daylight savingstime, run Control Panel, choose Date/Time, and select "AutomaticallyAdjust for Daylight Saving Time."
This behavior occurs because of the way that Windows NT stores timeinformation. All times displayed in Windows NT for event log events andfiles on NTFS partitions are computed as offsets to Greenwich Mean Time(GMT). When you set the time on your system, you are setting the value forGMT. When you select your local time zone for the system, the appropriatenumber of hours are added or subtracted to the stored GMT value. Thisadjusted time is displayed. When "Automatically Adjust for Daylight SavingTime" is selected, an additional hour is added to GMT during daylightsavings time (the first Sunday in April through the last Sunday inOctober).

If you are viewing another machine remotely across one or more time zonesthrough Event Viewer, the times for events on the remote system appearrelative to your local time. In other words, if you are viewing an eventremotely that actually occurred at 8:00 PM Central Daylight Time, the timedisplayed for the event on your computer will be 6:00 PM when you view theevent from the Pacific Daylight Time zone.

When Windows95 or Windows NT clients access network resources they arepassed the GMT time of the file stored on the NTFS partition. When theclient recieves the time stamp in GMT they then adjust the time stamp (+)plus or (-) minus the time zone they are set for.

In the case of WINDOWS NT - it also adjusts for daylight saving time anddisplays the file's time stamp for the correct local time includingDaylight Saving Time setting.

In the case of WINDOWS95 - The time returned by the file system is notadjusted for Daylight Saving Time. This feature is by design, and wasimplemented to work with servers such as NetWare that do not support theDaylight Saving time APIs and time functions in Windows 95. In this casethe files will display off by one hour. this is BY DESIGN for WINDOWS95clients.
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Article ID: 129574 - Last Review: 10/11/2007 02:30:52 - Revision: 2.8

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  • kbusage KB129574