What is the ACL function which extracts the "date" in the element "datetime" in the XUI window?

I use the ACL function "dlgitem_get_value" to get the value of the element "datetime" but this function returns an integer.

For exemple, I select the date "10/10/2013", and the function returns the integer "1381356000".

I would like a function which returns the string ""10/10/2013". Is it possible?

Kind regards,

David