Regional context
Timezones across Europe
Europe stretches across four main timezones — GMT/BST (UK, Ireland, Portugal), CET/CEST (most of continental Europe), EET/EEST (Greece, Finland, the Baltics), and MSK (Russia's westernmost cities). Most countries observe DST in unison — last Sunday of March to last Sunday of October — creating clean 1-hour steps between neighbouring zones. Icelandic and Russian cities are exceptions with no seasonal shift.