I think a lot of places on the site that get the date stamped do display the year, but I noticed profile messages only get the day/month. I'd like to see the year stamped there as well...just because :).
Looks like in-game/tournament messages could get the year too, perhaps tournaments moreso than in-game, but just info that I like to see and would be more important in the future.
Added!
Boots/Surrenders window only contain Day/Month/Time. Might be nice to see Year added there.