Most time zones were based upon GMT, as an offset of a number of hours (and possibly half or quarter hours) "ahead of GMT" or "behind GMT". Greenwich Mean Time was adopted across the island of Great Britain by the Railway Clearing House in 1847 and by almost all railway companies by the following year, from which the term "railway time" is derived.
It was gradually adopted for other purposes, but a legal case in 1858 held "local mean time" to be the official time.
On 14 May 1880, a letter signed by "Clerk to Justices" appeared in The Times, stating that "Greenwich time is now kept almost throughout England, but it appears that Greenwich time is not legal time.
For example, our polling booths were opened, say, at 8 13 and closed at 4 13 p.m." This was changed later in 1880, when Greenwich Mean Time was legally adopted throughout the island of Great Britain.
GMT was adopted in the Isle of Man in 1883, in Jersey in 1898 and in Guernsey in 1913.
GMT was adopted in the Isle of Man in 1883, in Jersey in 1898 and in Guernsey in 1913.
GMT was adopted in the Isle of Man in 1883, in Jersey in 1898 and in Guernsey in 1913.
Ireland adopted GMT in 1916, supplanting Dublin Mean Time.
Hourly time signals from Greenwich Observatory were first broadcast on 5 February 1924, rendering the time ball at the observatory redundant. The daily rotation of the Earth is irregular (see ΔT) and has a slowing trend; therefore atomic clocks constitute a much more stable timebase.
The instant that was designated as "December 31.5 GMT" in 1924 almanacs became "January 1.0 GMT" in 1925 almanacs.
The latter convention was adopted on and after 1 January 1925 for astronomical purposes, resulting in a discontinuity of 12 hours, or half a day.
The instant that was designated as "December 31.5 GMT" in 1924 almanacs became "January 1.0 GMT" in 1925 almanacs.
Spain's time is the direct result of Franco's presidential order (published in Boletín Oficial del Estado of 8 March 1940) abandoning Greenwich Mean Time and advancing clocks one hour, effective from 23:00 on 16 March 1940.
Some examples are: Belgium: Decrees of 1946 and 1947 set legal time as one hour ahead of GMT. Ireland: "Standard Time" is defined as being one hour in advance of GMT.
Some examples are: Belgium: Decrees of 1946 and 1947 set legal time as one hour ahead of GMT. Ireland: "Standard Time" is defined as being one hour in advance of GMT.
Under subsection 23(3), the same rule applies to deeds and other instruments. During the experiment of 1968 to 1971, when the British Isles did not revert to Greenwich Mean Time during the winter, the all-year British Summer Time was called British Standard Time (BST). In the UK, 00 is disseminated to the general public in winter and 00 in summer. BBC radio stations broadcast the "six pips" of the Greenwich Time Signal.
Retrieved 9 July 2009. Standard Time Act, 1968.
Under subsection 23(3), the same rule applies to deeds and other instruments. During the experiment of 1968 to 1971, when the British Isles did not revert to Greenwich Mean Time during the winter, the all-year British Summer Time was called British Standard Time (BST). In the UK, 00 is disseminated to the general public in winter and 00 in summer. BBC radio stations broadcast the "six pips" of the Greenwich Time Signal.
(Irish statute) Standard Time (Amendment) Act, 1971.
On 1 January 1972, GMT was superseded as the international civil time standard by Coordinated Universal Time, maintained by an ensemble of atomic clocks around the world.
The more specific terms UT and UTC do not share this ambiguity, always referring to midnight as zero hours. == GMT in legislation == === United Kingdom === Legally, the civil time used in the UK is called "Greenwich mean time" (without capitalisation), according to the Interpretation Act 1978, with an exception made for those periods when the Summer Time Act 1972 orders an hour's shift for daylight saving.
The more specific terms UT and UTC do not share this ambiguity, always referring to midnight as zero hours. == GMT in legislation == === United Kingdom === Legally, the civil time used in the UK is called "Greenwich mean time" (without capitalisation), according to the Interpretation Act 1978, with an exception made for those periods when the Summer Time Act 1972 orders an hour's shift for daylight saving.
The Interpretation Act 1978, section 9, provides that whenever an expression of time occurs in an Act, the time referred to shall (unless otherwise specifically stated) be held to be Greenwich mean time.
(Canadian statute) Interpretation Act 1978.
(UK statute) Interpretation Act 2005.
Retrieved 4 January 2008. Seago, J.H., & Seidelmann, P.
Retrieved 8 July 2009. Guinot, Bernard (August 2011).
Retrieved 9 July 2009. Standard Time Act, 1968.
Retrieved 8 July 2009. Guinot, Bernard (August 2011).
Retrieved 19 January 2018. "Six pip salute".
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