BRUSSELS—When Europeans set their clocks back next Sunday, it could be one of the last times 500 million people simultaneously get an extra hour of sleep. After four decades of synchronized time change, the European Union’s 28 countries are debating whether to go their separate ways, risking a temporal Tower of Babel over which clocks where are springing forward or falling back.

Source: Wall Street Journal October 18, 2018 14:21 UTC