GMT Full Form in time | What is the Full Form of GMT

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Green Wich Mean Time

GMT stands for Greenwich Mean Time. It's the mean solar time at the royal observatory in Greenwich London. It's measured on the zero degree line of longitude of the world (meridian).
This line runs from the North Pole to South Pole, i.e. passes through the Old Royal Observatory, Greenwich in London.
Greenwich Mean Time may be a global time standard. It had been established in the year of 1884 and used as a standard to scale all the time within the world. It's used as a benchmark for all time zones.
Sometimes, Greenwich Mean Time is understood Greenwich Meridian Time because it's measured from the Greenwich Meridian Line.
It's based on the rotation of the world which is irregular but it follows a fictitious mean and considers a consistent uniform along the equator.
Greenwich Mean Time is an international time. It's the basis of world time. This is often an absolute time reference. It doesn't change with season.
If a country is found to the east of the Greenwich Meridian, its local time is ahead GMT, e.g. the local time of China is GMT+8 hours.
Similarly, if a country is found to the west of Greenwich Meridian, its local time is behind the GMT, e.g. the local time of New York is GMT 4 in summer and GMT -5 hours in winter.

Longitude and Latitude of Greenwich

Longitude of the Greenwich mean solar time is 0º 0' 0" and Latitude of the Greenwich Mean Time is 51º 28' 38"N (North of the Equator).

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 world is irregular (see ΔT) and features a slowing trend; therefore atomic clocks constitute a way more stable time base.
Universal Time (UT), a term introduced in 1928, initially represented mean solar time at Greenwich determined within the traditional way to accord with the originally defined universal day.
From 1 January 1956 (as decided by the International Astronomical Union in Dublin in 1955, at the initiative of William Markowitz) this "raw" sort of UT was re-labelled UT0 and effectively superseded by refined forms UT1 (UT0 equalized for the consequences of polar wandering) and UT2 (UT1 further equalized for annual differences due to the season in Earth rotation rate).
On 1 January 1972, GMT was superseded because the international standard time standard by Coordinated Greenwich Mean Time, maintained by an ensemble of atomic clocks around the world.
Until 2 August 1880, it had been not adopted officially by British Parliament.
On 18 November 1883, it had been adopted by the United States (USA).
GMT was internationally adopted in 1884 within the International Meridian Conference and 24 time zones were created.
Today, it's used because the UK's standard time or UTC.