Time Zone in London, England, United Kingdom in 1800

The graph above shows that there is no clock change in London during 1800.

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.

Time zone changes for: Recent/upcoming years2020 — 20292010 — 20192000 — 20091990 — 19991980 — 19891970 — 19791960 — 19691950 — 19591925 — 19491900 — 19241850 — 18991800 — 1849

Year	Date & Time	Abbreviation	Time Change	Offset After
1800 — 1846	No changes, UTC -0:01:15 hours all of the period
1847	Wed, Dec 1 at 12:00 am	LMT → GMT	+0:01:15 hours (TZ change)	UTC
1848 — 1849	No changes, UTC all of the period
* All times are local London time.

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