Britain’s twice-yearly clock changes have a history stretching back more than a century, shaped by wartime priorities, energy conservation and the need to make better use of daylight. However, before the country adopted a more unified approach to timekeeping, communities followed their own local clocks. The Scottish town of Paisley provides an interesting example of how time once varied from place to place.
On Sunday, October 25, clocks across the United Kingdom moved back by one hour as British Summer Time (BST) ended and Greenwich Mean Time (GMT) resumed. The autumn adjustment brings lighter mornings but earlier sunsets as the country enters the winter season.
The practice of changing clocks developed from efforts to extend daylight during the warmer months. One of the best-known advocates was William Willett, who published a proposal in 1907 arguing that people could make better use of daylight if clocks were moved forward during summer.
Willett believed that adjusting the time would allow people to enjoy more daylight after work and reduce the need for artificial lighting. Although his campaign attracted attention, the proposal was not immediately adopted.
The outbreak of the First World War eventually gave the idea greater momentum. With energy supplies under pressure, governments began looking for ways to reduce fuel consumption. Britain introduced daylight saving in 1916 through the Summer Time Act, moving clocks forward during the summer months in an effort to conserve energy and extend usable daylight into the evening.
Timekeeping arrangements changed again during the Second World War, when Britain introduced additional summer-time measures. These adjustments were intended to make more daylight available during the evening while the country faced wartime demands.
In the decades that followed, the government continued to examine whether the seasonal clock system was the most effective arrangement. Between 1968 and 1971, Britain experimented with keeping clocks one hour ahead of GMT throughout the year. The trial was eventually abandoned amid concerns about dark winter mornings and the impact on people living in different parts of the country.
The familiar system of moving clocks forward in spring and turning them back in autumn was subsequently restored.
Paisley’s connection to local time
Long before standard time became widely established, towns and cities often set their clocks according to the Sun’s position. This meant that local time could differ depending on a community’s geographical location.
Paisley, situated west of Glasgow in Scotland, lies farther west than London. Because of this difference in longitude, the Sun reaches its highest point in Paisley later than it does in the capital. Historically, when London’s local solar time reached noon, Paisley’s was approximately 11:42 a.m.
This difference did not mean Paisley operated under a separate national daylight-saving system. Instead, it reflected an era when time was determined locally, before a common standard was adopted across the country.
The town’s Coats Observatory also forms part of this history. Founded in the nineteenth century, the observatory supported astronomical research and the accurate measurement of time. Observations of celestial movements helped communities establish local time before standardised systems became commonplace.
The expansion of the railway network later made uniform time increasingly necessary. When trains travelled between towns operating on different local clocks, coordinating timetables became difficult. A common time standard helped improve transport schedules and made communication and commerce more efficient.
Over time, standardised time replaced the patchwork of local clocks, creating a more consistent system across Britain.
Today, the annual spring and autumn adjustments remain part of everyday life, although their benefits and drawbacks continue to attract debate. Some people welcome the extra evening daylight during summer, while others question whether changing clocks twice a year remains necessary.
The history behind the practice demonstrates how timekeeping has adapted to changing social and economic needs. From wartime efforts to conserve energy to the railway industry’s demand for reliable schedules, several factors helped shape the system used today.
Paisley’s past offers a reminder that time was once closely connected to geography and the movement of the Sun. Although clocks across Britain now follow a common schedule, the town’s history illustrates how differently people once measured the passing of the day.
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