British Summer Time, some people refer to it as Daylight Saving Time, is the practice of advancing the clock time to make better use of the longer daylight available during summer so that darkness falls at a later clock time.
It was first proposed by Benjamin Franklin in a satirical 1784 essay, the modern proposal for daylight saving time came from New Zealand entomologist George Hudson in 1895. In 1907, British builder William Willett also independently advocated for it, eventually leading to its widespread adoption.