March 26th here in the UK, where it is called "British Summer Time". 1 hour of ahead of Greenwich Mean Time, based on noon at the Greenwich Meridian (0º Longitude).
Depending on which change, many people witter about an hour less or more in bed, but I have never bought that because the hours of day and night do not change, only the clock time, so the supposed loss or gain is taken up on the first night of the new time setting. I let myself sleep naturally then adjust the clocks after getting up.
