How to change the BIOS time on a Hyper-v guest vm without changing host's time?

Posted on 2010-09-05
Medium Priority
Last Modified: 2012-05-10
For testing purpose I need to modify the date/time in the BIOS of a virtual machine created on hyper-v server but always failed.
After some searching, it seems like there is no way I can do it unless I modify the host's date/time which I don't want to.
Can someone tell me how to do it withouth changing the time on hyper-v host server?
Question by:brothertu

Expert Comment

ID: 33608007
When you boot up the guest you should be able to enter the bios during startup. Then you can change the bios time without changing it on the host. Change the post delay time in the os so it allows you to have time to see which key it is to access the Bios.

Accepted Solution

shanyuen earned 1000 total points
ID: 33608537

Hyper-V VMs do still have a virtual machine BIOS; however, all of the BIOS features (e.g. numlock setting, boot device order, etc.) may be set in the virtual machine configuration or using a script. As a conseqence of this, Microsoft has removed the ability to access the BIOS at boot time.
LVL 13

Expert Comment

by:Greg Hejl
ID: 33610893
in hyper v manager - click on vm - open settings - go to integration services for vm (bottom left) - turn off time synchronization -
 login to vm - open services,  stop Hyper-V time synchronization service - change to manual -
 go to vm control panel > date and time >turn off internet time setting - change time and date on vm

Author Comment

ID: 33617524
thanks for all the replies.
I can't enter the BOIS setting from bootup, tried several keys: F2,F10,Esc, Del.

My problem is that, there is no OS installed on the virtual machine. And I need to change the BIOS time before install OS.

Although the news from your link is negtive but I guess this might be the truth that there is no way to get into vm BIOS during bootup. I wonder if you have seen any official clarificaition from Microsoft?


Featured Post

Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

I’m willing to make a bet that your organization stores sensitive data in your Windows File Servers; files and folders that you really don’t want making it into the wrong hands.
If you need to complete a Physical to Virtual (P2V), Virtual to Virtual (V2V) conversion to a VMware product (VMware Workstation, Player or VMware vSphere (ESXi) ) for FREE, then there is some good news...
To efficiently enable the rotation of USB drives for backups, storage pools need to be created. This way no matter which USB drive is installed, the backups will successfully write without any administrative intervention. Multiple USB devices need t…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…

607 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question