Is it possible to configure Windows 7 to use YYYY-MM-DD instead of DD/MM/YYYY as the date format? How? Where?
Go to Start > Control Panel > Regional and Language Options.
Here you can configure long and short date options on the Formats tab. Click additional settings to customize the formate more under the Date tab
Edit: Updated with more detail:
Changing Date Format in Windows 7
I hope this more detailed answer helps someone in the future. Apologies for the screens as VirtualBox isn't the best with them. Feel free to update with some better ones
This should be exactly how to do it with screenshots and all. Let us know if that doesn't work for you.