Sorry for bringing up this old topic, but I would like to request this feature as well. The reason for that is very simple, there are thousands of games from the 90s and 80s out there with uncertain release date. Nobody knows for sure when exactly they were released, except the year. Forcing Launchbox users to use a random date that is simple wrong isn't useful at all (and it doesn't look nice too).
The better way is to implement a simple (Premium) feature (at least for BigBox) that give the user the choice to switch from a DD/MM/YYYY format to a "Year only" format.
This would be such an important feature for me that I would renew my licence instantaneous! And I believe a LOT of people would appreciate it as well.
So please @Jason Carr consider implementing this neat little feature for us :)