Counting days and celebrating anniversaries makes me personally very uncomfortable. There's a very strong part of me that wants to screw up anything that is good, stable and positive and so the more emphasis I put on the longevity of my not drinking, the more prone I am to subconsciously try and screw that up.
I do find it interesting, I guess, to hear approximately how long someone has not drank - but truthfully I am sort of a subscriber to the belief that the past or future does not exist except for in my mind and so I try not to dwell too much on time, period.