At the center of GMT is the Royal Observatory in Greenwich, London, which sits on the Greenwich Meridian, or longitude zero. Greenwich Mean Time, abbreviated GMT, is a time zone that covers parts of Europe, Africa and Antarctica. However, you’ve probably also noticed the same time zones referred to as GMT -5 or GMT+5, and it’s equally correct… or is it? If UTC is a time standard, and GMT is a time zone, why the confusion, and why is UTC and GMT used interchangeably? Let’s take a closer look at GMT to figure it out. As an example, Eastern Standard Time (New York Time) is UTC-5, meaning it’s five hours behind UTC, whereas time in Central Asia will be at UTC+5 – that is, five hours ahead. The UTC standard monitors atomic time and is always at the “zero” hour anything West of UTC will have a minus offset, and anything East of it will have a positive offset (that’s why you hear time being “behind” or “ahead” when you’re looking at different time zones around the world). Each of these slices is a time zone, and each is coordinated using the Coordinated Universal Time (UTC) standard. This happened in the late nineteenth century when a Scottish-Canadian engineer and inventor Sandford Fleming proposed dividing the Earth into 24 slices of 15 degrees each. Midday in Hawaii will occur at a different time than in Moscow precisely because of the rotation of the Earth, so to make sense of time around the world and to calculate what time is it where, time zones were introduced. You know that most countries around the world have their own time zone, but you’re not sure why? There’s a simple explanation: Earth rotates by 15 degrees every hour, and that means that noon hits different places of the planet at different times. Ready to get your time right? Let’s dig right in: What Are Time Zones Exactly? And if you’re here for some fascinating time zone trivia, be sure to read the entire article – we’ve listed some fun time zone facts at the bottom of the page. ![]() To clear it up, let’s talk about time zones, UTC, UTC offset, and the GMT time zone specifically: after all, time is precious, and understanding time zones can save you a lot of stress and hassle if you work or communicate with people around the world. Curiously enough, the history of using GMT and UTC is intertwined, and it’s no wonder it’s still causing confusion. Why? While both terms are used to define the “zero” hour on which the time zone calculations around the world are based, there is one big difference between GMT and UTC – and that is, one is a time zone and the other is a time standard. However, you’ve probably also heard of UTC, and often, GMT and UTC are confused. Uses the closest city, rather than the more common Eastern,Ĭentral, Mountain or Pacific time zones in the United States.Like most people, you’ve probably heard of GMT, or the Greenwhich Mean Time, and you know it’s used to refer to a time zone. Seconds announced at irregular intervals to compensate for theĮarth's slowing rotation. Seconds defined by International Atomic Time (TAI), with leap ![]() Time (UTC), or Greenwich Mean Time (GMT). Positive or negative offset computed from Coordinated Universal Use it as a meeting planner or a scheduler to find the best time The calculator will automaticallyĪdjust for daylight saving time (DST) in the summer. You can enter airports,Ĭities, states, countries, or zip codes to find the time differenceīetween any two locations. This is the best time to reach them fromĬonverter for places all over the world. This will be between 7AM - 11PM their time, since London, United Kingdom is 5 hours ahead of Hanahan, South Carolina.īut you want to reach someone in London, United Kingdom at work, you may want to try between 4:00 AM and 12:00 PM your time. If you live in Hanahan, SC and you want to call a friend in London, United Kingdom, you can try calling them between 2:00 AM and 6:00 PM your time. Schedule a phone call from Hanahan, SC to London, United Kingdom That will end up being between 2:00 PM and 5:00 PM in London, United Kingdom. ![]() Meeting at the best time for both parties, you should try between 9:00 AM and 12:00 PM your time in Hanahan, SC. Meeting planner for Hanahan, South Carolina and London, United Kingdom
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