Wintertijd

Wintertijd is the Dutch term for the standard time period observed during the winter months in the Netherlands and many other European countries. It corresponds to Central European Time (CET), which is UTC+1. The opposite period is zomertijd, or daylight saving time, when clocks are set one hour forward.

In practice, the switch between wintertijd and zomertijd happens twice a year, by one hour. In the Netherlands and throughout the European Union, the transition takes place on the last Sunday in March (clocks move forward one hour) and on the last Sunday in October (clocks move back one hour). During wintertijd, local time is CET (UTC+1); during zomertijd, it is CEST (UTC+2).

Wintertijd was introduced to better align daylight hours with daily activity and to improve energy efficiency, especially in the late 20th century. The practice is coordinated at the European level to keep clocks synchronized across member states, facilitating transport, business, and communication.

The change affects daily life, with longer mornings in winter and longer evenings in summer, and has been part of public debate due to health, safety, and logistical considerations. In recent decades there have been discussions in the EU about ending seasonal clock changes, but as of now most member states continue to observe wintertijd and zomertijd twice a year.