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Time Zone in London, England, United Kingdom in 2009

7:19:04 pm GMT

Thursday, March 28, 2024

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Current: GMT — Greenwich Mean Time
Next Change: BST — British Summer Time
Current Offset: No UTC/GMT offset
Difference: 4 hours ahead of Washington DC
Location of LondonLocation

2009 Time Zones - London

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The graph above illustrates clock changes in London during 2009.

London in GMT Time Zone

London uses Greenwich Mean Time (GMT) during standard time and British Summer Time (BST) during Daylight Saving Time (DST), or summer time.

The Difference between GMT and UTC

In practice, GMT and UTC share the same time on a clock, which can cause them to be interchanged or confused. However, there is an essential difference between the two:

  • UTC is a time standard that forms the base of time zones worldwide and is not used as a time zone in any country. Time zones are defined by their offsets from UTC. Since GMT has a UTC offset of zero, there is no time difference between the two.
  • GMT is a time zone used in the UK and other European and African countries.

A source of confusion is that GMT used to be the world's time standard before UTC was introduced. Until 1972, time zones were defined by their offset from GMT based on mean solar time at the prime meridian in Greenwich near London.

What About BST?

During Daylight Saving Time, clocks in the United Kingdom are set forward one hour to British Summer Time (BST). The UK is the only country that observes BST in the summer. Some other countries, such as Ireland, observe the same local time, but under a different name.

Time Changes in London Over the Years

Daylight Saving Time (DST) changes do not necessarily occur on the same date every year.

YearDate & TimeAbbreviationTime ChangeOffset After
2000Sun, Mar 26 at 1:00 amGMTBST+1 hour (DST start)UTC+1h
 Sun, Oct 29 at 2:00 amBSTGMT-1 hour (DST end)UTC
2001Sun, Mar 25 at 1:00 amGMTBST+1 hour (DST start)UTC+1h
 Sun, Oct 28 at 2:00 amBSTGMT-1 hour (DST end)UTC
2002Sun, Mar 31 at 1:00 amGMTBST+1 hour (DST start)UTC+1h
 Sun, Oct 27 at 2:00 amBSTGMT-1 hour (DST end)UTC
2003Sun, Mar 30 at 1:00 amGMTBST+1 hour (DST start)UTC+1h
 Sun, Oct 26 at 2:00 amBSTGMT-1 hour (DST end)UTC
2004Sun, Mar 28 at 1:00 amGMTBST+1 hour (DST start)UTC+1h
 Sun, Oct 31 at 2:00 amBSTGMT-1 hour (DST end)UTC
2005Sun, Mar 27 at 1:00 amGMTBST+1 hour (DST start)UTC+1h
 Sun, Oct 30 at 2:00 amBSTGMT-1 hour (DST end)UTC
2006Sun, Mar 26 at 1:00 amGMTBST+1 hour (DST start)UTC+1h
 Sun, Oct 29 at 2:00 amBSTGMT-1 hour (DST end)UTC
2007Sun, Mar 25 at 1:00 amGMTBST+1 hour (DST start)UTC+1h
 Sun, Oct 28 at 2:00 amBSTGMT-1 hour (DST end)UTC
2008Sun, Mar 30 at 1:00 amGMTBST+1 hour (DST start)UTC+1h
 Sun, Oct 26 at 2:00 amBSTGMT-1 hour (DST end)UTC
2009Sun, Mar 29 at 1:00 amGMTBST+1 hour (DST start)UTC+1h
 Sun, Oct 25 at 2:00 amBSTGMT-1 hour (DST end)UTC
* All times are local London time.

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7:1904pm
Thursday, March 28, 2024