title: Change date and time in BIOS of virtual machine
body: <p>I would like to change date in Virtual Machine, but I want to do this by command line. I use this line:</p>
  
  <pre><code>VBoxManage modifyvm MyVirtSystem -biossystemtimeoffset -1209600000
  </code></pre>
  
  <p>It shoulds change date to two weeks ago, but I get this error message:</p>
  
  <pre><code>VBoxManage.exe: error: Failed to create the VirtualBox object!
  VBoxManage.exe: error: Code CO_E_SERVER_EXEC_FAILURE (0x80080005) - Server execu
  tion failed (extended info not available)
  VBoxManage.exe: error: Most likely, the VirtualBox COM server is not running or
  failed to start.
  </code></pre>
  
  <p>Have you any ideas what I do wrong?</p>