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Below is the "official" instruction on winding back your clock for one hour (not to forget do the same for your mobile phone, Apple iPhone, PDA and notebook computer)!
When local daylight time is about to reach
Sunday, 5 April 2009, 03:00:00 clocks are turned backward 1 hour to
Sunday, 5 April 2009, 02:00:00 local standard time instead