GMT (Greenwhich Mean Time) is the UK standard timezone.
UTC is Universal Coordinated Time. It is a standard time that is the basis of all other time zones.
The + or – tells you to add or subtract the zone value from UTC.
UTC+8 would mean the current UTC time with 8-hours added to it.
For example, at the time of posting this, it is 0645 UTC. Due to daylight savings, GMT is currently 0745. (This means it is UTC+1)
In New York (UTC-5) it is 0245 because we subtract 5 hours from UTC.
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