Adjusting the clocks at the same time is important, for example, in international rail and air traffic. The clocks are always changed on the last Sunday of March and October. Early Sunday morning was chosen as the least inconvenience, because traffic is at its lowest then.
The decision to end seasonality was postponed
The original target schedule of the Commission’s proposal has not been achieved. In the spring of 2019, the European Parliament voted in favor of ending seasonal variation. At that time, Parliament proposed that the clocks be turned back for the last time in 2021.
However, the proposal still awaits consideration by the EU Council, as the Council and the Parliament decide on the matter together. A review by the Council would require all member states to form their position on the issue. The matter is not under consideration by the Council for the time being.
Source: Ministry of Transport and Communications
Source: The Nordic Page