Combine a Date attribute and an Enumeration attirbute into one string to populate the Summary attribute

How do I combine the values of the following two attributes into one string to populate the Summary attribute?
1) Date (Date/Timestamp)
2) Type (Enumeration)

I have been following this article to try to get my code up and running but I can't get the information to display in my Summary field.

http://www.ibm.com/developerworks/rational/library/rational-team-concert-calculated-fields-work-item/

Any help will be greatly appreciated. Thank you...