What steps will reproduce the problem?
1. Build a gson with setDateFormat
Date date = new Date();
Gson gson = new GsonBuilder().setDateFormat("MM/dd/yyyy").create();
System.out.println(gson.toJson(date));

What is the expected output? What do you see instead?
Expected is "08/27/2010"
Date results in standard format: "Aug 27, 2010 10:21:32 AM"

What version of the product are you using? On what operating system?
1.5

Please provide any additional information below.
It works ok in 1.4 but when I change to 1.5 it ignores the setDateFormat() 
method