In 2015, daylight saving time (DST) for the US started on March 8th and will end on November 1st. In the following 10 years, it begins between March 8 and March 14 (on Sunday) and it ends between November 1 and November 7 (also on Sunday).
The government might decide to change these dates and announce the changes just days or weeks before. The daylight saving time dates differ for each country, and some countries do not use this system at all, such as most countries in the southern hemisphere. However, if a country from below the equator participates, it will begin DST between September and November and end it between March and April. For example, in Uruguay, summer begins on October 4 and ends on March 8.