Since time zones count outwards from GMT/UTC, knowing the time there means you can quickly calculate the time anywhere in the world. What is a GMT watch? (Image credit: Rolex/Omega/Longines) ...

Enter any time in Etc/UTC and find the corresponding asia/kabul time using this Time Calculator. Etc/UTC is a UTC +00:00 timezone offset where as GMT is a UTC 0:0 timezone offset. Time difference ...

This entire concept stems from Greenwich, England, which is why UTC is sometimes referred to as Greenwich Mean Time (GMT) or Zulu (zero) Time (Z). To expand on this idea, check out this map.

Greenwich Mean Time (GMT) is the time measured on the Earth's zero degree line of longitude, or meridian. ... UTC. Some broadcasters show times in UTC (Co-ordinated Universal Time).

Greenwich Mean Time (GMT) ... This is essentially the same as GMT, but UTC is measured by an atomic clock and is thus more accurate - by split seconds. It is used primarily for scientific purposes.