Hey, DST starts tonight in Europe. Sunday morning on 01:00:00 GMT the clocks will go forward to 02:00:00 BST in the Western European Time Zone (UK, Ireland, Portugal; but Island does not introduce DST), from 02:00:00 CET to 03:00:00 CEST in the Central European Time Zone (most of the countries as Germany, Spain, France, Poland, etc.) and from 03:00:00 EET to 04:00:00 EEST in the Eastern European Time Zone (Finnland, Ukraine, Greece, Baltic Countries). The rule is designed so that it happens at the same moment all through Europe.
Your watch should start auto syncing one minute after the change so make sure it succeeds so that you have the correct time :)