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London timezone information

UTC/GMT Offset Daylight time zone - UTC/GMT 1 hour in daylight saving time (BST)
Next time change on 10/27/2019 01:00 am (local time) (GMT)
Daylight saving time Actually in DST
Daylight Saving Time start on : Sunday 31 March 2019 am:00 am
Daylight Saving Time end on : Sunday 27 October 2019 01:00 am

Actual offset : UTC/GMT + 1 hour (in DST time)
In DST Time : UTC/GMT + 1 hour
In STD Time : UTC/GMT + 0 hour

Geographical and astronomical datas : United Kingdom

Coordinates Latitude : 51° 30' north
Longitude : 0° 07' west
Astronomic Observations Sunrise at : 04:57 am
Transition hout : 12:57 pm
Sunset at : 08:57 pm
Duration of day : 15 hours
Civil twilight start at : 04:13 am
Civil twilight end at : 09:40 pm

About Official time for Europe - London (England)

Some clock-shift problems could be avoided by adjusting clocks continuously or at least more gradually—for example, Willett at first suggested weekly 20-minute transitions—but this would add complexity and has never been implemented.
DST inherits and can magnify the disadvantages of standard time
For example, when reading a sundial, one must compensate for it along with time zone and natural discrepancies.
Daylight saving has caused controversy since it began.
The fate of Willett's 1907 proposal illustrates several political issues involved
The proposal attracted many supporters, including Balfour, Churchill, Lloyd George, MacDonald, Edward VII (who used half-hour DST at Sandringham), the managing director of Harrods, and the manager of the National Bank
However, the opposition was stronger: it included Prime Minister Asquith, Christie (the Astronomer Royal), George Darwin, Napier Shaw (director of the Meteorological Office), many agricultural organizations, and theater owners
After many hearings the proposal was narrowly defeated in a Parliament committee vote in 1909
Willett's allies introduced similar bills every year from 1911 through 1914, to no avail.
The U.S. was even more skeptical: Andrew Peters introduced a DST bill to the U.S. House of Representatives in May 1909, but it soon died in committee.
Poster titled "VICTORY! CONGRESS PASSES DAYLIGHT SAVING BILL" showing Uncle Sam turning a clock to daylight saving time as a clock-headed figure throws his hat in the air
The clock face of the figure reads "ONE HOUR OF EXTRA DAYLIGHT"
The bottom caption says "Get Your Hoe Ready!"
Retailers generally favor DST
United Cigar Stores hailed a 1918 DST bill.
After Germany led the way with starting DST (ger.: Sommerzeit) during the World War I on 30 April 1916 together with its allies to alleviate hardships from wartime coal shortages and air raid blackouts, the political equation changed in other countries e.g
the United Kingdom used DST first on 21 May 1916.
U.S. retailing and manufacturing interests led by Pittsburgh industrialist Robert Garland soon began lobbying for DST, but were opposed by railroads
The U.S.'s 1917 entry to the war overcame objections, and DST was established in 1918.
The war's end swung the pendulum back

Source : Wikipedia
Others cities in this country : Belfast - Edinburgh - Grand Turk - Bermuda - Cardiff - Gibraltar - Greenwich - Stanley