GST, EST, and GMT are acronyms for: Greenwich Mean Time - GMT Eastern Standard Time - EST
The term standard refers to the fact that it is a timezone based on the Greenwich meridian (Longitude 0°). As a side note - the Greenwich meridian passes through London. There are many time zones based on the Greenwich meridian, each 15° (three hours) away from GMT.
UTC is the standard time used in most parts of the world. It stands for Universal Time Coordinate, and it's a 24-hour clock based on the Earth's rotation. In other words, UTC does not account for daylight saving time. To convert from UTC to local time, you must add the number of hours that your country's time zone is ahead of UTC. For example, if it is noon in UTC and the time in your country is 6 pm, then you would add 7 hours to get a total of 11 pm.
The `EST` time zone abbreviation is a common way to express dates and times within the United States. This is defined as being -5 hours behind UTC; thus, `EST` is the same as `UTC-05` in the time zone converter. EST stands for Eastern Standard Time.
The world has 24 different time zones, and they all exist at different times. For example, if it's 3:00 in New York City (NYC),then it is the following in the other time zones: Chicago (US central time zone) = 08:00, Sydney (Australia) = 17:00. If you are a developer, you need to know the timezones to develop features that work in line with all the regions.
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