UTC is effectively the new name for GMT. It has very minor differences, but none that will impact you in that scenario. Servy's comment is completely wrong saying GMT includes daylight savings. That's a different timezone called BST that the UK moves to from GMT over summer.
Greenwich Mean Time is same as the UTC (GMT) universal time. GMT current date is 2nd Sunday May 2021. Current time in GMT (GMT). 2 May 2021 Sunday. GMT is the common abbreviation for Greenwich Mean Time. It shows the mean solar time at the Greenwich Meridian, which passes through Greenwich Royal Observatory. Time zone offset. GMT is a time zone and UTC is a time standard. However, GMT and UTC share the same current time in practice. Dan KI4AX WQ4G, Nov 15, 2018 #4. As a result, their UTC or GMT offset would change from UTC -5h or GMT - 5h to UTC -4h or GMT - 4h. In places not observing Daylight Saving Time the local UTC or GMT offset will remain the same year round. Arizona, Puerto Rico, Hawaii, U.S. Virgin Islands and American.
Coordinated Universal Time (UTC)
Coordinated Universal Time (UTC), also referred to as Greenwich Mean Time (GMT), Universal Time (UT), or 'Zulu' is an international time scale used in Amateur Radio, astronomical aviation publications and applications, weather reporting, the military, NASA, and other organizations and documents.
Therefore, if you are in a different location than the reference location, your local time would be either earlier or later referenced to that UTC location point.
So in other words, it doesn't matter where you travel to, whether you're in a hotel in San Francisco or in one of the many Washington DC hotels, the UTC time is the same. Or for that matter, anywhere on earth, the UTC time is still the same!
UTC Conversion Table
Now although everyone uses the same clock so to speak, most of us live in different locations of the earth and in different time zones. If we need to know what time, (UTC), it is somewhere else, we need to convert from our time zone to UTC.
Don't forget that the day advances at midnight or retreats to previous day depending on where you are and the dirction of the conversion! You can actually be talking to someone on the radio who is in your future or in your past, depending on your point of view and your reference in time! Time travel without a time machine!....just rf and some distance!
With a little practice using the chart above, you can determine how far 'ahead' or 'behind' you are by a + or - factor of hours. Comparing CST with UTC as an example, UTC is 6 + hours ahead.
How do you know what the correct UTC time is?
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Several radio stations worldwide transmit precise time signals on HF bands and other frequencies. NIST (U.S.A.), continuously broadcasts time signals with voice announcements over hf radio frequencies from stations WWV in Fort Collins, Colorado and WWVH in Kauai, Hawaii. Both stations transmit on 2.500, 5.000, 10.000, and 15.000 MHz. WWV also operates on 20.000 MHz.
If propagation is 'right', you can use Canada's Institute for National Measurement station, CHU. It transmits time signals and voice announcements from Ottawa, Ontario. CHU broadcasts continuously on 3.330, 7.335, and 14.670 MHz, also AM as with WWV and WWVH.
There are also many other stations around the world that transmits time signals and some are strong enough to be heard in the U.S and Canada. There are many ore on the lower frequencies below standard AM broadcast, but they are extremly difficult to hear due to distances, static and power levels. They are not listed here.
See chart below:
The frequencies are believe to be accurate and remember..propagation plays a big part in receiving them. You also have to remember that radio travel a near the speed of light around the world so there is a split second error for listeners in the U.S. tuned to WWV OR WWVH. Believe me, it is accurate enough to set that old clock on your wall very accurately!
The following is a table of some major time stations reported to be in operation from various sources including radio verification at the time of this article, 2007.
Helpful links with more info!
World Time Zone Map (NIST)
The Official U.S. Time (NIST) Java Application online time
North America Time Zones (U.S.Time zones from NIST)
Freeware desktop clock utility for Windows 95/98/Me/NT/2000/XP
Set it to display local or UTC time on your Desktop!
More Freeware Time syncronization software!
Download free computer time synchronization software (Alpha Clock)
It automatically synchronizes the computer system time clock with the National Institute of Standards and Technology (NIST) time servers.
It uses Coordinated Universal Time from the national time scale UTC(NIST) and sets the correct time on your computer according to your local time zone.
(UTC clock at top of this page provided by World Time Server)
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GMT vs UTC
When it comes to time keeping, one should know that the time difference between GMT and UTC is a fraction of a second and, for most common purposes, that difference is insignificant and considered as no difference. However, there are some other differences between GMT and UTC when it comes to usage. Before going into those differences, let us first see what GMT and UTC stand for. GMT is Greenwich Mean Time whereas UTC is Coordinated Universal Time. GMT refers to the time maintained at the Royal Observatory in Greenwich, London called the mean solar time. UTC is based on International Atomic Time (TAI).
What is GMT?
GMT, which stands for Greenwich Mean Time, is based on astronomical observations. GMT is a country based time standard. It is used primarily by bodies associated with the United Kingdom like the BBC World Service, the Royal Navy, and the Met Office. As a matter of fact, several countries adopt GMT in their legislation. They are the United Kingdom, Belgium, Republic of Ireland, and Canada.
What is UTC?
UTC, which stands for Coordinated Universal Time, is an international time scale recommended by the International Bureau of Weights and Measures (BIPM) as the legal basis for time. It is a method of measuring time using atomic clocks. To determine the international standard of Coordinated Universal Time, the Bureau of Weights and Measures (BIPM) in Paris Coordinates data from atomic clocks located in timing laboratories around the globe. It is interesting to note that leap seconds are added to UTC to compensate for the slowing rotation of the Earth. It is important to know that leap seconds are used to allow UTC to track the mean solar time in the Royal Observatory in Greenwich, London.
UTC is the time standard used for Internet and World Wide Web standards. It is also the basis of the satellite global positioning system (GPS). UTC is used by the Network Time Protocol, created to synchronize the clocks of many computers over the Internet. Thus, it can be said that the UTC is Internet based time standard.
The difference between Greenwich Mean Time and Coordinated Universal Time is measured in fractions of a second. In common use, when fractions of a second are considered not very important, GMT can be taken equivalent to UTC. The time difference is important, however, in scientific matters.
It is often thought that time zones around the world are positive or negative offsets from UTC. In fact, it is quite true that UTC replaced GMT as the main reference time scale in various regions.
Why it is called UTC? The International Telecommunication Union otherwise called ITU thought that it was best to have a single abbreviation for use in all the languages so that confusion can be curbed to a great extent. In fact, they could not arrive at a conclusion whether to have the English word order or the French word order and hence as a result the acronym UTC was chosen.
What is the difference between GMT and UTC?
• GMT stands for Greenwich Mean Time and UTC for Coordinated Universal Time.
• Greenwich Mean Time is based on astronomical observations.
• Coordinated Universal Time (UTC) is an international time scale recommended by the International Bureau of Weights and Measures (BIPM) as the legal basis for time. It is a method of measuring time using atomic clocks.
• The time difference between UTC and GMT lies in fractions of a second. Therefore, for common purposes, both the times are considered the same. But, the time difference is important for scientific purposes.
• GMT is adopted in their legislations as in countries such as United Kingdom, Belgium, Republic of Ireland and Canada.
• UTC is the time standard used for several Internet and World Wide Web standards.
• It can be said that the UTC is Internet based time standard whereas GMT is country based time standard.
- Time by Alan Cleaver (CC BY 2.0)