Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: W7 advances clock multiple times after DST

05 Apr 2018   #1
metalbunny

Windows 7 Home Premium x64
 
 
W7 advances clock multiple times after DST

On the 25th of March we switched to DST here in Denmark and Windows correctly advanced the clock 1 hour at 2 am like it was supposed to. Then today it added another hour to the clock so I had to set it back to the correct time manually.

This weird behaviour started happening 2-3 years ago after a Windows update to the DST settings. When we go into DST it will set the clock on the correct date, then a few days later it will add another hour, and then after a few days more it will set the clock again. When we return to normal time (CET) in the fall it's the same issue - it will set the time on the right date, and then take another hour of a few days later. Each time it happens 2-3 times before it stops changing the time for no reason.

It only does this around the DST forward/backwards dates. Once I reset the clock manually it sticks. The time zone is set right, the clock is right otherwise, it's set to auto-adjust time from time.windows.com.

There are two event log entries whenever it changes the time, but in this case this part is different:

Code:
Previous Time:        ‎2018‎-‎04‎-‎05T08:09:41.281252600Z
New Time:        ‎2018‎-‎04‎-‎05T07:09:39.000000000Z
Code:
Previous Time:        ‎2018‎-‎04‎-‎05T07:09:39.000000000Z
New Time:        ‎2018‎-‎04‎-‎05T07:09:39.000000000Z
The rest of the entries are normal.

There are two entries each time it changes the clock and it "blames" the Windows Time Service for setting the time each time, but I cannot find any entries that mention the DST. There's only one entry for time sync in the task scheduler (unless it's buried in the wrong place) and that's set to run each Friday - so not in the middle of the week.

This is Windows 7 Home SP1 (US/UK English Windows with Danish Locale settings). According to Windows Update it's fully updated.


My System SpecsSystem Spec
.
08 Apr 2018   #2
Snick

Win 10 x64, Linux Lite, Win 7 x64, BlackArch, Kali, VMWare Workstation Player, OpenVPN
 
 

Hi metalbunny,
This weird behavior started happening 2-3 years ago after a Windows update to the DST settings.
If you know what KB you referred to, you can uninstall the update and hide it.
My System SpecsSystem Spec
10 Apr 2018   #3
metalbunny

Windows 7 Home Premium x64
 
 

Quote   Quote: Originally Posted by Snick View Post
Hi metalbunny,
This weird behavior started happening 2-3 years ago after a Windows update to the DST settings.
If you know what KB you referred to, you can uninstall the update and hide it.
I don't know the exact number anymore and I'm not entirely certain that's what caused it, I just don't know what else would. There have been several updates that changes the DST settings for various time zones since, but it hasn't fixed this weird behaviour.

I changed the Windows time server to dk.pool.ntp.org after the OP to see if it makes a difference. So far the clock hasn't gone wrong, but until we switch back to CET in October I won't know for sure if this solves my problem permanently.
My System SpecsSystem Spec
.

10 Apr 2018   #4
Paul Black

Windows 7 Home Premium 64-bit 7601 Multiprocessor Free Service Pack 1
 
 

Hi metalbunny,

These are some of the updates for changes in Windows 7 for Time Zone:

KB3112148: December 2015, cumulative time zone update.
KB3077715: August 2015 cumulative time zone update
KB3013410: December 2014 cumulative time zone update.
KB2998527: September 2014 time zone update for Russia.
KB2981580: August 2014 cumulative time zone update.
KB2922717: Time zone changes for Jordan, Brazil, and Fiji.
KB2904266: December 2013 cumulative time zone update.
KB2863058: August 2013 cumulative time zone update.
KB2779562: December 2012 cumulative time zone update.
KB2756822: October 2012 cumulative time zone update.
KB2660075: Time and date if the time zone is set to Samoa.
KB2633952: December 2011 cumulative time zone update (supersedes/replaces update 2570791 rel August 2011).
KB3148851: Time zone changes for Russia.

I hope this helps!
My System SpecsSystem Spec
15 Apr 2018   #5
bendipa

Windows 7 64 Bit
 
 

The problem lies with Windows not operating on UTC, I had the same issue here in the UK when the time changed on the same date and clocks went forward by an hour from GMT to BST. To adjust the time zone to UTC, open up the registry, then browse to HKLM>System>ControlSet001>Control>TimeZoneInformation.

Make a new binary value in right pane called RealTimeIsUniversal, and give it a value of 1. Close the registry and adjust your time in Windows to whatever it is now. Your hardware clock (in BIOS) should be 1 hour behind.
My System SpecsSystem Spec
16 Apr 2018   #6
Snick

Win 10 x64, Linux Lite, Win 7 x64, BlackArch, Kali, VMWare Workstation Player, OpenVPN
 
 

bendipa, is this the same issue as linux/win7 dual boot changing times?
My System SpecsSystem Spec
17 Apr 2018   #7
metalbunny

Windows 7 Home Premium x64
 
 

Quote   Quote: Originally Posted by bendipa View Post
The problem lies with Windows not operating on UTC, I had the same issue here in the UK when the time changed on the same date and clocks went forward by an hour from GMT to BST. To adjust the time zone to UTC, open up the registry, then browse to HKLM>System>ControlSet001>Control>TimeZoneInformation.

Make a new binary value in right pane called RealTimeIsUniversal, and give it a value of 1. Close the registry and adjust your time in Windows to whatever it is now. Your hardware clock (in BIOS) should be 1 hour behind.
This raises the question of how NTFS deals with UTC. Would it assume the current time stamps are in UTC or what does it do? Because it seems like things could get a little "funny" with the backup when there's a few million files that have never had UTC timestamps. Unless what it tells me and what it tells the programs are two different things.

I use SyncToy for backup, but I don't actually know if it looks at the timestamps or just goes by the "A" attribute.
My System SpecsSystem Spec
17 Apr 2018   #8
bendipa

Windows 7 64 Bit
 
 

Quote   Quote: Originally Posted by Snick View Post
bendipa, is this the same issue as linux/win7 dual boot changing times?
I believe so, and funnily enough I do have both systems, both of which now synchronise with the correct time. But the important thing is that the Windows side was the clock to correct, not that of Linux.
Quote   Quote: Originally Posted by metalbunny View Post
This raises the question of how NTFS deals with UTC. Would it assume the current time stamps are in UTC or what does it do? Because it seems like things could get a little "funny" with the backup when there's a few million files that have never had UTC timestamps. Unless what it tells me and what it tells the programs are two different things.

I use SyncToy for backup, but I don't actually know if it looks at the timestamps or just goes by the "A" attribute.
I don't use Synctoy so have no idea there. I wrote my own script for data backups based on xcopy, and that works on the archive attribute.
My System SpecsSystem Spec
Reply

 W7 advances clock multiple times after DST




Thread Tools




Similar help and support threads
Thread Forum
BSOD Multiple types multiple times a day, can't pin down the problem
Hello everyone, I came here once before for assistance, but the issue was unable to be resolved. Here is the link to the previous thread. https://www.sevenforums.com/bsod-help-support/342840-several-bsod-no-singular-triggers.html There is no singular trigger to set this off. Sometimes I can...
BSOD Help and Support
Clock advances 7 hours once or twice per week
I've noticed recently that my computer time clock advances itself about 7 hours sometimes once a week or twice a week. It is set to the correct Time Zone(Pacific Time) and the CMOS Battery measures 3.05 volts. I have no gadgets on the desktop running. So, what could be causing this changing of...
General Discussion
BSOD Multiple times multiple errors 0x0000001A
Last week I started receiving BSODs, and after the first one it got to the point where my computer was not booting up and my hard drive was beeping very angrily at me. I was not sure what all the problems were, however I also knew that there was something seriously wrong with my hard drive, so I...
BSOD Help and Support
BSOD errors. multiple times during multiple programs
windows 7 x64 - original install on system but i don't have my disks. they are somewhere... - full retail version installed - age of the system is approximately 3 years - age of the install is approximately 2 years it seems to happen at random but i get BSODs. approximately 2-3 times a day...
BSOD Help and Support
Multiple BSOD at Random Times with Multiple Drivers Identified
I am trying to get my wife's new computer up and running without any BSOD or program failures. Note that the system was not initially set up to capture the dmp files so all the earliest ones are missing. I presented the initial problems to the original seller who recommended sticking with MSE and...
BSOD Help and Support


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 03:24.
Twitter Facebook Google+ Seven Forums iOS App Seven Forums Android App