Date adjustment rule (e.g. availability date)

First choose Export -> Edit (see previous example)

Next, go to Rules -> New Rule and select Edit Element

Select the element in which you want to write the resulting date

Select the "Date" content type

Now you need to select "Replace content"

Type "today" (as today to which the days will be added)

To add a day to the date, use the format "+ XXX days" where XXX can be the exact number of days, eg "10". The original value of 10 becomes the date today + 10 days.

The second option is to use a variable that have a number of days