add element to a list of date - convert text to date

Hello.
i don't understand how to set the value of a date field.
With Rules, I add a variable "list of datE", then I use ruleviews to collect the rows. Each element is a text like "28/11/2012" (the format is european, not american).
Then i iterate the display and for each element i try to add the element to the the list of date
But my element is a text string and i cannot convert in a date format.

If i use a variable of type "date" (not list of date), i can't set is value with an element of the list and with the content of another field date(.

I've tried with rules transform, that convert a text in a timestamp, but don't work.

Apparently, there is no way to set a date value from a variable or a list of text!