In the European Union, DST begins on the last Sunday in March and ends on the last Sunday in October. In the United States, for example, Daylight Saving Time begins on the second Sunday in March and ends on the first Sunday in November. However, not all countries observe DST, and the dates when it begins and ends can vary from place to place. Many countries around the world observe Daylight Saving Time (DST), also known as “summertime.” Some countries that observe DST include the United States, Canada, Mexico, most of Europe, parts of South America, and some countries in Asia and Africa. The specific dates when Daylight Saving Time begins and ends, and the amount of time that the clock is adjusted, can vary depending on the location. The purpose of Daylight Saving Time is to make better use of the available sunlight during the longer days of the summer by shifting some of the daylight from the morning hours to the evening hours. This is done by moving the clock ahead by one hour at a specified time in the spring and then moving it back by one hour at a specified time in the fall. In the context of time zones, “summertime” typically refers to Daylight Saving Time ( DST), which is the practice of setting the clock ahead by one hour during the summer months in order to extend the amount of daylight in the evenings. Some areas, such as parts of India, Iran, and Australia, use non-standard half-hour deviations. For example, China could be divided into several time zones, but instead, the whole country uses the same time. Thus, for convenience, entire countries tend to adjust to the same local time rather than adjusting exactly to the zones. Governments can change their country’s time zone. The zones were measured according to the Greenwich Mean Time, used as the starting meridian, which measured hours before and after GMT. There are 24 timezones, separated by one-hour intervals, with each 15 degrees longitude. If someone travels by plane between two zones, he or she will adjust his/her clock to the one used in the new zone. Within each zone, people set their clock for the same time. This is because we divide the earth into different time zones. Indiana introduced DST in 2006.When it is noon in Rio de Janeiro, it is midnight in Tokyo. Most of Arizona and Hawaii don't use DST. In addition the uninhabited atolls of Baker Island (AoE) and Wake Island (WAKT) add to the time zone count, making 11 the total number of time zones in the US.Īlmost all states in the US use Daylight Saving Time (DST). There are 9 official time zones according to the law. The time zones in the law are defined by their offset from Coordinated Universal Time (UTC). Code, Title 15, Chapter 6, Subchapter IX - Standard Time. Time zones in the USA are defined in the U.S. Since 1967, the US Department of Transportation (DOT) has been responsible for governing time zones in the country. The US was divided into 4 standard time zones on November 18, 1883, and jurisdiction for the zones was given to the Interstate Commerce Commission (ICC). Time Zones Being Used in Dependencies of United States Offset They will become active again after the next clock change as Daylight Saving Time begins or ends. The above time zones are used during other parts of the year. Time Zones Not Currently Being Observed in United States Offset Note: Local time in these time zones changes when Daylight Saving Time begins and ends. In practice, this means that the local time in these time zones changes when DST begins and ends. For example, Eastern Time (ET) refers to Eastern Standard Time (EST) or Eastern Daylight Time (EDT), depending on which is currently in use. The time zones in the contiguous US are often referred to by their generic name, without making a difference between standard time and Daylight Saving Time designations. Generalized Time Zones in United States Time Zone Abbreviation & Name Since Howland Island and Baker Island constitute the world's westernmost landmasses in relation to the International Date Line, making them the last places on Earth where any date exists, they are sometimes assigned a theoretical 12th time zone called Anywhere on Earth (AoE). As neither Hawaii nor the 5 dependencies use Daylight Saving Time (DST), there are only 6 corresponding DST time zones. In addition, Alaska, Hawaii, and 5 US dependencies all have their own time zones. The contiguous US has 4 standard time zones. However, adding the time zones of 2 uninhabited US territories, Howland Island and Baker Island, brings the total count to 11 time zones. There are 9 time zones by law in the USA and its dependencies. Time Zones Currently Being Used in United States Offset Business Date to Date (exclude holidays).
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