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I'm trying to get all my computers time to sync. I have a Windows Server 2012 with hyper-V. Running on the Hyper V is:

  1. a VM DC - parent Hyper-V is part of DC's domain
  2. a VM IIS server (workgroup)

I have some Windows 10 computers in workgroup and others connected to the domain

The Hyper V server, VM IIS server, and VM DC times do match.

I synced both the VM IIS server and a workgroup Windows 10 computer at the same time using time.nist.gov as the source. Both did not change and reported successful updates yet the time remains 6-7 mins different.

I'm assuming the VM IIS server uses the parent Hyper V time but then why does it give the option to sync with internet time?

Do I setup the VM DC with an external time source so that the times start syncing correctly?

My end solution was a combination of the accepted answer (disabled the time service integration feature for the VM DC) and setup / pushed an external time service group policy.

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You may simply need to uncheck the Time synchronization option from the Integration Services settings of the VMs in Hyper-V, and set each VM to synchronize their times from a reliable source manually one by one.

You could force all workgroup computers to use NTP from a local NTP server which is configured and confirmed to have the correct time in the workgroup, and force all domain computers to use NTP from a domain controller—maybe all can use the domain controller for NTP for sync from workgroup and the domain if the time is accurate for your needs.

I had an issue with a Hyper-V Server once that wasn't configured properly for NTP and the time on it got out of sync due to the Time synchronization setting being checked so I unchecked that option on the Hyper-V host, and then set the important VMs to sync their time from a reliable NTP source instead—a domain controller in that case.

Note: A bad CMOS battery can cause the machine time to get out of sync too.

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