Why did my Windows Server 2012 R2 timezone change overnight?
You need to look for the following type of event:
Log Name: System Source: Microsoft-Windows-Kernel-General Date: 8/17/2014 1:35:21 PM Event ID: 1 Task Category: None Level: Information Keywords: Time User: MYDOMAIN\Administrator Computer: WIN-3RBJO240LH2.mydomain.local Description: The system time has changed to 2014-08-17T16:35:21.300689700Z from 2014-08-17T16:35:21.300689700Z. Change Reason: System time adjusted to the new time zone.
You can see the time change was done because of a new timezone and which user did it.
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Wayne Bloss
Updated on September 18, 2022Comments
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Wayne Bloss almost 2 years
When I logged into my workstation this morning, the timezone had been changed from Eastern to Pacific. In the event viewer I see the following three events, all at 4:12:15 AM.
It looks like the timezone was not changed for the 1st and 2nd event but then somehow in the 3rd event changed from a timezone of T11 to T08. This is all very odd because I believe that when I installed the OS, that I set the timezone correctly to Eastern (I'm near NYC).
Here are the event logs:
1st event
The system time was changed. Subject: Security ID: LOCAL SERVICE Account Name: LOCAL SERVICE Account Domain: NT AUTHORITY Logon ID: 0x3E5 Process Information: Process ID: 0x3d8 Name: C:\Windows\System32\svchost.exe Previous Time: 2014-04-25T08:12:15.456072100Z New Time: 2014-04-25T08:12:15.455000000Z
2nd event:
Previous Time: 2014-04-25T08:12:15.456888000Z New Time: 2014-04-25T08:12:15.456000000Z
3rd event:
Previous Time: 2014-04-25T11:12:04.008461800Z New Time: 2014-04-25T08:12:15.456616800Z
Is there a benign explanation for this or could this be a virus?
Update 2014-05-01: More occurrences
This event happened three more times on 2014-04-26, all at exactly 3:02:15 AM. The event has not occurred since then.
Previous Time: 2014-04-26T07:02:15.198939400Z New Time: 2014-04-26T07:02:15.198000000Z Previous Time: 2014-04-26T07:02:15.200081200Z New Time: 2014-04-26T07:02:15.199000000Z Previous Time: 2014-04-26T07:02:13.067340800Z New Time: 2014-04-26T07:02:15.199708000Z
Update 2014-04-26: Result of w32tm /query /configuration
[Configuration] EventLogFlags: 2 (Local) AnnounceFlags: 10 (Local) TimeJumpAuditOffset: 28800 (Local) MinPollInterval: 10 (Local) MaxPollInterval: 15 (Local) MaxNegPhaseCorrection: 54000 (Local) MaxPosPhaseCorrection: 54000 (Local) MaxAllowedPhaseOffset: 1 (Local) FrequencyCorrectRate: 4 (Local) PollAdjustFactor: 5 (Local) LargePhaseOffset: 50000000 (Local) SpikeWatchPeriod: 900 (Local) LocalClockDispersion: 10 (Local) HoldPeriod: 5 (Local) PhaseCorrectRate: 1 (Local) UpdateInterval: 360000 (Local) [TimeProviders] NtpClient (Local) DllName: C:\Windows\system32\w32time.dll (Local) Enabled: 1 (Local) InputProvider: 1 (Local) AllowNonstandardModeCombinations: 1 (Local) ResolvePeerBackoffMinutes: 15 (Local) ResolvePeerBackoffMaxTimes: 7 (Local) CompatibilityFlags: 2147483648 (Local) EventLogFlags: 1 (Local) LargeSampleSkew: 3 (Local) SpecialPollInterval: 604800 (Local) Type: NTP (Local) NtpServer: time.windows.com,0x9 (Local) NtpServer (Local) DllName: C:\Windows\system32\w32time.dll (Local) Enabled: 0 (Local) InputProvider: 0 (Local) VMICTimeProvider (Local) DllName: C:\Windows\System32\vmictimeprovider.dll (Local) Enabled: 0 (Local) InputProvider: 1 (Local)
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Brad Bouchard about 10 yearsDo you have it synced with a proper NTP time source? If you don't know you can check with this command: w32tm /query /configuration
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MichelZ about 10 yearsWeird. Also, this is Zulu time/UTC (notice the
Z
at the end) and should thus be timezone-agnostic. -
Wayne Bloss about 10 years@BradBouchard - I started the Windows Time service and ran that command as Administrator. The results have been posted in an update to the question.
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Wayne Bloss about 10 yearsAlso, on the "Internet Time" tab of the Date and Time panel it says "This computer is set to automatically synchronize with 'time.windows.com'.
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Brad Bouchard about 10 yearsIs the issue still happening?
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Wayne Bloss about 10 years@BradBouchard - The event occurred 3 more times on the day after I corrected the timezone manually, but only minor time corrections were made (no timezone change). Nothing since then. I updated the post with time adjustments that those three events performed.
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Wayne Bloss about 10 yearsFor now I guess I'm going to chalk this up to me going through the installation too quickly and possibly forgetting to change the timezone after the initial installation. Either that or Windows Server wants to use UTC time now similar to Linux but I'm actually using it as a workstation/desktop, not a server.
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Ryan Ries about 9 yearsDoes the server use a dynamic IP address from a DHCP server by chance? DHCP servers have the ability to change the timezone of their clients.
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