As you probably know, you can include additional data in your profile which shows up next to your posts on the board's forums. A couple of years ago, we added extra text fields and options to display your favourite writers, directors, episode/s and seasons etc. We don't baffle new members by including all of these options on the member registration page, but everyone is free to update their profile at any time with this extra information. Sometimes its for fun, sometimes its useful.
Recently I began watching Millennium Season 1 again, its been some time since I last saw a full run of the show aside from seasonal episodes, and today I was inspired to add an additional option where members can store the date that they last saw Millennium, whether it be an episode or a season, it really doesn't matter.
You might find it interesting or useful from a person point of view to keep track, or it may be relevant to a topic you have contributed to.
So to enter March, 2006, you just enter 03-2006 including the hyphen.