Check if a day have past, and make a calcul.

Hi,

Here is the calendar I use : Here

My Question is :

Is it possible with the widget above, that at the end of a day a calcul is done? something like :

set $GMoney+=((random(1, 3)*$Population)/2)

And don't do that on Sunday. (I'm sure it will be to simple if I don't put a condition )

Thanks.