Daylight Saving Time (DST) is the method of advancing clocks (typically by one hour) during spring (“spring forward”) and putting the clocks back by one hour in autumn (“fall back”) to return to standard time. Thus, the clock timings are adjusted twice a year in some countries.
Purpose of DST
In summer, the sun rises earlier and sets later, therefore there will be more daylight hours. Thus if the clocks are extended in the summer months, there will be more functional hours of daylight. People will start their day an hour earlier and also will conclude their daily work practices an hour earlier. Consequently, there will be more extended evening daytime or an extra hour of daylight for activities, which provides lower consumption of electricity and other forms of energy.
In fall or autumn, as the span of daylight becomes more concise, clocks are set back to standard time.
Countries that follow DST
Currently, DST is followed by around 70 countries twice a year. In the United States, except for 2 states, all other states follow Daylight Saving Time (DST) method and change their clock twice a year. All European Union (EU) countries and many other European countries also follow the DST. Outside Europe also it is observed by countries such as Iran, Mexico, Argentina, Paraguay, Cuba, the Levant, New Zealand, parts of Australia, and Haiti.
Legislation of USA
On March 15th, U.S. Senate enacted a law (Sunshine Protection Act) to make daylight saving time (DST) permanent. This will discard the practice of adjusting clocks forward and back twice a year. If this law is given by the House of Representatives and is signed by President Joe Biden, it will come into effect from November 2023. Once the law is given, the method of shifting clocks back to standard time in November will stop and DST will be in effect throughout the year.