![]() UTC or atomic time that include leap seconds, guaranteed to always be within 0.9 seconds of GMT. GMT was replaced with UTC as reference time scale on 1 January 1972. This means that no country or territory officially uses UTC as a local time. UTC is not a time zone, but a time standard that is the basis for civil time and time zones worldwide.The time can be displayed using both the 24-hour format (0 – 24) or the 12-hour format (1 – 12 am/pm). GMT is a time zone officially used in some European and African countries.But GMT is a time zone and UTC is a time standard.Īlthough GMT and UTC share the same current time in practice, there is a basic difference between the two: GMT is often interchanged or confused with UTC. It is used to compare the pace provided by TAI with the actual length of a day on Earth. Universal Time (UT1), also known as astronomical time or solar time, refers to the Earth’s rotation.International Atomic Time (TAI): A time scale that combines the output of some 400 highly precise atomic clocks worldwide, and provides the exact speed for our clocks to tick.Two components are used to determine UTC: The world’s timing centers have agreed to keep their time scales closely synchronized – or coordinated – therefore the name Coordinated Universal Time. UTC is the time standard commonly used across the world. This 24-hour time standard is kept using highly precise atomic clocks combined with the Earth’s rotation. Coordinated Universal Time (UTC) is the basis for civil time today. UTC is abbreviated from Coordinated Universal Time and it is The World’s Time Standard. Thus, Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. Greenwich was a royal park and palace on a hill to the south of the River Thames east of London. It was chosen because the Prime Meridian (the line of 0° Longitude) runs through Greenwich. GMT stands for Greenwich Mean Time (also called Meridian Time or Zulu Time) and it is a time standard since 1884. Let us have a basic review of these terms. Although time terminologies are often spoken and used but still many of us do not have proper understanding of terms like GMT and UTC.
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