High Quality Content by WIKIPEDIA articles! European Summer Time is the arrangement in Europe by which clocks are advanced by one hour in spring and moved back in autumn, to make the most of seasonal daylight. This is done in all of the countries of Europe except Iceland, Belarus, and Russia. Summer Time was first introduced in some countries during the First World War, then largely abandoned with some exceptions, mostly during the Second World War, until the 1960s and 70s when the energy crisis prompted a wide scale re-introduction. The practice has been fully coordinated across the continent since 1996.