DOCUMENT:Q216913
TITLE   :BIOS Date Value Does Not Immediately Update on January 1, 2000
PRODUCT :Windows NT
PROD/VER:4.0
OPER/SYS:WINDOWS NT
KEYWORD :kbbug4.00 kbfix4.00 

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The information in this article applies to:

 - Microsoft Windows NT Workstation versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4 
 - Microsoft Windows NT Server versions 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3, 4.0 SP4 
 - Microsoft Windows NT Server, Enterprise Edition versions 4.0, 4.0 SP4 
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SYMPTOMS
========

When the Window NT System Time value rolls over from the year 1999 to 2000, the
Century Byte value stored in the real time clock (RTC) is not changed until up
to one hour later when the time daemon writes out the date. This issue only
affects systems with older BIOSes that do not automatically update the century
byte on reboot (contact your hardware manufacturer for BIOS details).
This issue may cause unexpected behavior under two conditions:

 - When your computer is configured using the dual boot option where another
   operating system may not handle this situation properly. All versions of
   MS-DOS fall into this category.

 - Some computer hardware BIOS configurations detect this behavior as an invalid
   date and present a query for the correct date. This may prevent a computer
   from restarting without user input.

NOTE: This problem only occurs if the computer is restarted during the time lapse
when the dates were out of synch.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or
the individual fix. For information on obtaining the latest service pack, please
go to:

 - http://www.microsoft.com/Windows/ServicePacks/

   -or-

 - Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

For information on obtaining the individual fix, contact Microsoft Product
Support Services. For a complete list of Microsoft Product Support Services
phone numbers and information on support costs, please go to the following
address on the World Wide Web:

   http://support.microsoft.com/support/supportnet/default.asp

This hotfix has been posted to the following Internet location as Biosfixi.exe
(x86) and Biosfixa.exe (Alpha):

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/
   hotfixes-postSP4/BIOS-fix/

NOTE: If this product was already installed on your computer when you purchased
it from the Original Equipment Manufacturer (OEM) and you need this fix, please
call the Pay Per Incident number listed on the above Web site. If you contact
Microsoft to obtain this fix, a fee may be charged. This fee is refundable if it
is determined that you only require the fix you requested. However, this fee is
non-refundable if you request additional technical support, if your no-charge
technical support period has expired, or if you are not eligible for standard
no-charge technical support.

For more information about eligibility for no-charge technical support, see the
following article in the Microsoft Knowledge Base:

   Q154871 Determining If You Are Eligible for No-Charge Technical Support

STATUS
======

Microsoft has confirmed this to be a problem in Windows NT version 4.0. This
problem was first corrected in Windows NT version 4.0 Service Pack 5.

Additional query words: 4.00 y2k
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