The Gregorian calendar is generally used to define days. UTC divides time into days, hours, minutes, and seconds. Most land-based time zones are different from UTC. For example, the UK uses British Summer Time in the summer. UTC isn’t affected by daylight saving time (DST), but some countries do change time zones during DST. It is based on very accurate atomic clocks and the fact that the Earth spins. GMT used to be a standard for the time, but now most countries in Africa and Western Europe use it as their time zone. Greenwich Mean Time (GMT) is the average sun time at the Royal Observatory in Greenwich, London, which is thought to be at a zero-degree longitude.Įven though GMT and Coordinated Universal Time (UTC) both show the same time, GMT is a time zone and UTC is a time standard that civil time and time zones around the world are based on.

Most of the time, they are based on the borders of countries or the lines of longitude. What is Time Zone?Ī time zone is an area on Earth where everyone keeps the same time. Also, if you’re calling or emailing someone in Atlanta from a different time zone, it’s a good idea to double-check the current time difference between your place and Atlanta to avoid any confusion. This is important to remember when going to Atlanta or setting up talks with people there. The time changes on the second Sunday of March and stays the same until the first Sunday of November. Make a Phone Call from Alabama to Atlanta, Georgiaĭuring normal time, the Eastern Time Zone is five hours behind Coordinated Universal Time (UTC-5:00), and during daylight saving time, it is four hours behind (UTC-4:00).

Atlanta time zone gmt