Select in Field action for a Specifc state

[#1]

Hi,

I want to create a button that will automatically select different values for the same field on 2 different states.

For example -

I have a DATE field and states "Before" and "After".

When pressing the button I want the DATE in the "Before" state to selet last week's date (today()-7) and in the "After" state to select today().

I used to do it with Variables, can it be done with alternate states?

Thanks,

Yoav