Daylight Saving Time History in United States

Sunrise and sunset on 11th March 2018 are about an hour behind the day before. More light in the evening

Sunrise and sunset on November 4, 2018 will be about an hour earlier than the previous day. More light will come out in the morning

Most of the United States's daylight saving time (DST) begins on the second Sunday in March and ends on the first Sunday in November.

The US Daylight Saving Time (DST) starts on the second Sunday in March and ends on the first Sunday in November. The current timetable started in 2007 according to the 2005 energy policy law.

According to Article 110 of the same law, the Department of Transportation (DOT) manages the use of DST. The law does not affect the right to select states and regions that do not conform to DST.

Historically, there was no uniform daylight saving time rule from 1945 to 1966. This caused extensive confusion, especially in traffic and broadcasting. The Unified Time Law of 1966 first adjusted the date of the transformation of the United States

After the oil embargo in 1973, the US Congress extended the DST period to 10 months in 1974 and 8 months in 1975 to save energy.

After the end of the 1976 energy crisis, the US DST program was revised several times. From 1987 to 2006, the country observed the DST for about seven months each year.

Daylight saving time (daylight saving time), daylight saving time (the United States), daylight saving time (UK and others) is the custom of lengthening nighttime daylight saving time by sacrificing normal sunrise time by advancing the clock during the summer. Normally, in areas where daylight saving time is used, adjust the clock one hour before the beginning of spring and return to the standard time of autumn. In fact, DST shortens spring sleeping time and reduces fall sleep time by one hour.

Daylight saving time in the United States advances one hour during the warmest month of the year. As a result, more daylight savings time in the evening, less in the morning. Daylight saving time (DST) has been observed in most parts of the United States except Arizona (except for Navajo observing daylight saving time in tribal land), Mariana's overseas territory in North America, American Samoa in Guam. Puerto Rico and US Virgin Islands. The Unified Time Act of 1966 established a unified daylight saving time system in the United States

In some countries, including the United States and Europe, daylight saving time before the longest day is shorter than later time. For example, in the United States, daylight saving time is defined by the 2005 Energy Policy Law. The daylight saving time period is extended by changing the start date from the first Sunday in April to the second Sunday in March. The end date is from the last Sunday in October until the first Sunday in November. The possibility of DST saving energy is mainly due to the impact on residential lighting, which consumes about 3.5% of electricity in the US and Canada. (In contrast, air conditioners use 16.5% of energy in the United States.) Delaying the nominal time of sunset and sunrise will reduce the use of artificial light at night and increase in the morning.

On Sunday, November 4, most Americans set the watch to one hour, as daylight saving time (sometimes referred to as daylight saving time erroneously) ends and most Americans "lose" one hour of whiteness . Changes to these watches in spring and fall inherit the traditional energy-saving tradition of Benjamin Franklin for a long time. (According to the Senate bill and news report, this year, Sunshine's goal is to completely stop watch changes and adjust it to daylight saving time all year round.)