Strong controversy has arisen in recent years on the pros and cons of seasonal time change. Many countries decide to change to summer or wintertime to save energy, but it also has adverse impacts on crop yields and animal welfare, interrupting the biorhythms of livestock, which, for example, affects the milking of cows. Changes of time also have a negative impact on public health, with children and older people being those most affected. In any case, any time change in the EU must be coordinated for the functioning of transport and the internal market.