UTC+1 means the local clock reads one hour later than Coordinated Universal Time. When it is 12:00 UTC, a place on UTC+1 reads 13:00.
In winter this offset covers most of western and central Europe — Paris, Berlin, Madrid, Rome — as Central European Time. It also covers Nigeria and several other West African countries all year round. In summer the United Kingdom moves to UTC+1 as British Summer Time, while the European mainland moves on to UTC+2.