[ntp:questions] NTP client with ability to write Windows NT system time to hardware clock?

Brolin Empey brolin at brolin.be
Sat Dec 11 22:21:56 UTC 2010

David Woolley wrote:
> unruh wrote:
>> On 2010-12-11, Jan Ceuleers <janspam.ceuleers at skynet.be> wrote:
>>> Piece of feedback below.
>>> There's no way I'm going to read all that. If you have a question for
>>> us, please can you put it a little more succinctly? Thanks.

Actually, I /did/ write my question succinctly at the end of my post.

>> To summarize as I understand it-- how do you keep the RTC
>> synced to the "true time" under Windows? (System running ntp so assume
>> that the system time is the "true time").
> He wants the RTC to contain UTC, even though Windows isn't in the GMT
> timezone with DST disabled. Windows normally stores the system wall
> clock time.

My RTC already runs in UTC, but my RTC is approximately 2 minutes behind 
because I have no way of writing the Windows NT system time to the 
hardware clock (RTC) after using an NTP client to synchronise the 
Windows NT system time.  On Ubuntu, I use ntpdate-debian + hwclock, but 
I cannot find a real hwclock for Windows NT, only malware which uses the 
name hwclock.exe as a disguise.  I need an hwclock.exe application for 
Windows NT so I can run “hwclock --utc --systohc” like on Ubuntu.  I am 
asking in this group because I thought someone may know of an NTP client 
for Windows NT with this functionality, now that Microsoft has finally 
fully fixed support for RealTimeIsUniversal=1 beginning in Windows Vista 
SP2 + Windows 7.

My original post (and this reply too) make perfect sense to me, but I 
suspect my readers did not have all of the required background knowledge.

If you are not already familiar with Windows NT’s RealTimeIsUniversal 
registry key, please read 

If you are not already familiar with the hwclock command from the 
util-linux(-ng) package, please read 

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