Dynamic Stamps - Is There An Alternate Code To Show Date?

Hi, I've created a custom dynamic stamp which when used shows a person's name and current date by using the Javascript code from Acrobat's own dynamic stamps:
 
event.value = (new Date()).toString();
AFDate_FormatEx("h:MM tt, mmm dd, yyyy");
event.value = "By " + ((!identity.name || identity.loginName != (event.source.source || this).Collab.user) ? (event.source.source || this).Collab.user : identity.name)
+ " at " + event.value;
 
Works fine in Acrobat 7 but not 8, the date is missing and from what I can gather it's a bug and may have something to do with the clocks going back.
 
Is there a alternate code I could use to do the same thing please as I really need to fix it?
 
Cheers
Lisa