DOCUMENT:Q140639  08-AUG-2001  [winnt]
TITLE   :Daylight Savings Time Not Advancing
PRODUCT :Microsoft Windows NT
PROD/VER:winnt:3.51
OPER/SYS:
KEYWORDS:kbbuglist

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The information in this article applies to:

 - Microsoft Windows NT Workstation version 3.51 
 - Microsoft Windows NT Server version 3.51 
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SYMPTOMS
========

On a small percentage of computers running Windows NT, a clock or application
running on the desktop does not reflect the Daylight Savings time change even
though the user has set Date/Time to "Automatically Adjust for Daylight Saving
Time" in the Control Panel. Instead, the time displayed on applications such as
the Accessories Clock show a continuation of Daylight Saving Time while the
Control Panel's Date/Time displays the new Standard Time.

CAUSE
=====

Each hour, Windows NT runs code that examines the system time versus the time
stored in the CMOS clock. In some computers, Windows NT's system time (which is
computed by interrupts) can drift. If more than one minute of drift is detected
and if this drift is detected and corrected during the one hour between 1am and
2am on Daylight Savings Time/Standard Time switch over dates, time will not
switch properly.


WORKAROUND
==========

To work around this problem, open Control Panel, click the Date/Time icon, and
click OK. Do not click the Cancel button because the system time will not change
but the application times will jump ahead by one hour on some computers.

RESOLUTION
==========

This problem has been corrected in the latest Service Pack for Windows NT
version 3.51.

STATUS
======

Microsoft has confirmed this to be a problem in Windows NT version 3.51. This
problem was corrected in the latest Windows NT 3.51 U.S. Service Pack. For
information on obtaining the Service Pack, query on the following word in the
Microsoft Knowledge Base (without the spaces):

   S E R V P A C K


Additional query words: prodnt

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Keywords          :  kbbuglist
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNT351search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS351 kbWinNTS351search
Version           : winnt:3.51

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Copyright Microsoft Corporation 2001.