Struts2 TypeConverter

[Nigel King]

I'm trying to implement a TypeConverter in Struts2.
I have class - Conference - which contains a list of Events and each of these events has a startdate.
The Conference is set in the action.
What I want to do is set up a converter just for this startdate.
If I add

java.util.Date=my.new.DateConverter

it works okay but that's obviously for all dates.
I think I should be able to add this into a MyAction-conversion.properties file.
How do I specify that I'd like this *only* to be used for my Conference->Event->startDate field.