Patrick: when do you go on Daylight Saving Time.....I know it's different than in North America and of course would mess up the deadline for puzzles for a short time.
It is in fact possible to find this information on the Interwebs
Google points me to this page:European Summer Time
So the first upcoming time change is on March 25th.
Yes, in the last 14 years, as seen in the google reference that you mention, in the countries involved (coloured in red), those that use Central European Time (either winter or summer), we have been accustomed to those changes in the clock the last weekend of March and the last weekend of October. It always takes place the night from Saturday to Sunday (so the impact on the people, business, etc., is minimized), this year 2012 the night from Sat 24 to Sun 25 (March) (next year it will not be in your birthday, sneaklyfox), at 02:00 on Sunday 25, we will move the clock to 03:00 (many people do it late in the night on saturday
) having from this point 2 hours of difference with the "solar time", let's say, the Greenwich Meridian Time for Spain and France, for instance (this night we loose one hour of sleep and the day has "23 hours"). Inversely, the last weekend of October, 27-28 this year, at 03:00 we will move the clock to 02:00 (we gain an hour of sleep, the trains stop one hour, etc. ... and the day has "25 hours"). UK, Ireland, Portugal and Canary Islands (Spain) (coloured in blue), ... , have one hour less the full year (either in winter or in summer) with respect to the rest of the European countries coloured in red (this last is a big area, some advantages, if you travel from Paris to Berlin you keep the same times
For me, a similar mnemonic rule, for instance, for the Thanks Giving Day (to remember if it was the third or the last Thursday of November) took me some time.