Central Uppsala, Sweden, on 12.11.2011 (one day after the 11.11.2011, when the six-digit date had the same digit six times, the next time won't come until 11.11.2111, which will be even better). Although Uppsala is in very much southern Sweden, the weather was already so cool I was freezing when I arrived, and eager to get to my hotel. Luckily it was very nearby.