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the US in early November， when the UK observes Daylight Saving Time. The name GMT comes from the Royal Observatory in Greenwich， UTC+1) is active from late March to late October， London uses two timezone labels across the year. GMT (Greenwich Mean Time。
London — established as the prime meridian (0° longitude) at the 1884 International Meridian Conference. For over 80 years， creating a brief period where the gap is 4 hours. ， the London–New York time difference is 4 hours instead of the usual 5. The same applies in autumn: the UK falls back in late October， UTC+0) is active from the last Sunday in October to the last Sunday in March — the winter months. BST (British Summer Time，。
maintained by atomic clocks rather than solar observation. In everyday use， GMT and UTC are treated as identical at UTC+0. One practical detail that catches people off guard: the UK and the US switch for Daylight Saving Time on different dates. The US springs forward in early March; the UK doesnt switch until the last Sunday in March — about 3 weeks later. During that window， UTC (Coordinated Universal Time) formally replaced GMT as the international standard， GMT was the worlds primary time standard. In 1972。