Who determines the day for daylight saving?

Answer 1

There is no worldwide standard; each country decides whether or not to do daylight saving time (a.k.a. summer time) and, if so, when to begin and end it.

In the United States, federal law sets the dates for beginning and ending D.S.T. across the whole country, and each state has the option of passing a state law to opt out of it.

Answer 2

Daylight saving time is typically determined by the government of each country. They choose the dates for when daylight saving time begins and ends based on factors such as energy saving goals and daylight hours. In the United States, for example, it is determined by the Energy Policy Act of 2005.