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Blog di Bernardino (Dino) Ciuffetti
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01 Apr 11 Setting VirtualBox guest bios time offset

Hi.

If you have a guest VirtualBox VM with the system clock out of sync with your host system, and when you try to set the guest system time manually it get automatically setted out of sync, you may want to run this command on your host system:

VBoxManage modifyvm <vm_name> –biossystemtimeoffset <time offset in ms>

Hope you get out of this trouble quickly. That took me hours to debug it!!