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I recently got Windows XP for VirtualBox. However, I can't change the system date. As soon as I change it, it reverts to a different date. How can I overcome this?

I am assuming you have GA installed, yes?

Read section 9.2.13 of the user manual. There are some parameters you can control regarding the GA and time synch between the host and the guest.

I installed the guest additions and I followed what you said. However, I don't know how to change the timesync interval. I tried changing it in command prompt by using vboxservice and vboxcontrol but it didn't change the interval. Any ideas?

MOD Edit: Multi-posting is not allowed. Other (latest post) deleted.

You can set the bios system time offset with the following command.
VBoxManage modifyvm <uuid|name> [--biossystemtimeoffset <msec>]

Hi everyone,

I used the following command "VBoxManage modifyvm <uuid|name> [--biossystemtimeoffset <msec>]" to change the date in my VM, but instead of delaying those mseg from the real time of the Bios,the time of my VM was advanced.What can I do to fix it?any idea?.

Thank you very much!

If a positive number advances the clock, does a negative number retard it?

I'm not sure at all.
I entered this:
VBoxManage modifyvm Nere --biossystemtimeoffset 100000000. It's supposed to retard it, isn't it?

That's a positive number and it is advancing the clock. As you want to retard it, why don't you try a negative number?

Yes,u're right!
Thanks!;-)