If clause depending on name of the day

[Sven Bretfeld]

Hi all

Is it possible to have an if-condition that looks for the current day?
So that the then-expression does something different on Tuesday than on
Friday? 

This is not working:

 (if (string-equal 'current-time-string ".*Tue.*")
    (delete-other-windows)
  (split-window-horizontally))

Thanks for help

Sven

p.s. unnecessary to mention that I have only a weak knowledge of elisp.