WET : Western European Time : United Kingdom, Ireland, Portugal - shown in yellow on the map

CET : Central European Time : Austria, Belgium, Czech Republic, Germany, Denmark, Spain, France, Hungary, Italy, Luxembourg, Malta, The Netherlands, Poland, Slovakia, Slovenia, Sweden, Norway, Switzerland - shown in green on the map

EET : Eastern European Time : Cyprus, Estonia, Finland, Greece, Latvia, Lithuania, Bulgaria, Romania, Belarus, Moldova, Turkey, Ukraine - shown in orange on the map

If you are still unsure use The World Clock converter availble here.