Although not used by most of the world's nations, daylight saving time is used throughout Europe.

The original purpose of the shift to summer time was to make better use of daylight and save energy, but opponents argue that it disrupts sleep patterns, people's mood and health.

The practice of switching to daylight saving time was introduced in Slovenia by law in 1983 due to an oil crisis.

The final decision that clocks will be adjusted forward one hour every last Sunday in March and turned back every last Sunday in October was made in 2006.