Changing the output of Getdate

Question

Is it possible to deceive SQL Server to return a different date on GetDate() without actually changing the machine date?
This would be great, since we have

Answer 1

SELECT DATEADD(dd, -7, GETDATE())

Answer 2

No, there is not much you can do other than something like this:

SELECT GETDATE()-7  --get date time 7 days ago

Answer 3

You can always wrap GetDate() in a custom function and use that everywhere, although it's not an optimal solution.

Answer 4

According to the documentation for getdate():

This value is derived from the operating system of the computer on which the instance of SQL Server is running.

Since it's derived from the OS, I don't think you can change it separately.