What is the difference between UTC and GMT?
Quick Answer: UTC (Coordinated Universal Time) is the official time standard used worldwide, based on atomic clocks. GMT (Greenwich Mean Time) is a time zone originally based on the Earth's rotation at Greenwich. They are often the same in practice, but UTC is more precise and used for global timekeeping.
UTC is a time standard that relies on atomic clocks, making it extremely accurate and stable. It doesn’t change with seasons or daylight saving time. This makes it perfect for coordinating time across the globe.
GMT started as a solar time at the Greenwich Observatory in London, tied to the Earth's rotation. It’s still used as a time zone in some countries but lacks the atomic precision of UTC. Think of GMT as a time zone, while UTC is the precise time reference behind it.