Why Greenwich is Not GMT: Understanding Time Changes in the UK

Learn why Greenwich local time varies from GMT, especially during daylight saving time adjustments.

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Greenwich is not GMT because the local time in Greenwich changes with daylight saving time, while GMT (Greenwich Mean Time) is a time standard that does not change. Greenwich follows BST (British Summer Time) in the summer, which is GMT+1. Therefore, when daylight saving time is in effect, Greenwich is not on GMT.

FAQs & Answers

  1. What is the difference between GMT and BST? GMT is a constant time standard, while BST is the daylight saving time observed in the UK, which is GMT+1 during summer.
  2. Why do we have daylight saving time? Daylight saving time is implemented to make better use of daylight during the longer days of summer, effectively saving energy.
  3. Does Greenwich ever follow GMT? Yes, Greenwich follows GMT when daylight saving time is not in effect, typically from late October to late March.
  4. How do time zones affect international travel? Time zones can create confusion during international travel; it's essential to check local times and adjust itineraries accordingly.

Watch More

For more insights on time zones and how they affect your schedule, check out our videos on daylight saving time and the history of timekeeping.

  1. Understanding the Difference Between BST and GMT: A Quick Guide Learn why British Summer Time (BST) is different from Greenwich Mean Time (GMT) and how they relate to each other.
  2. Is London Always GMT? Understanding Time Zones and Daylight Saving Explore why London isn't always on GMT and learn about British Summer Time.