GMT-9 is 9 hours behind Greenwich Mean Time (GMT).
Gambier Islands, part of French Polynesia, are on a minus 9 hours offset. Alaska Standard Time (AKST) is also 9 hours behind GMT.
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Nowadays, Greenwich Mean Time, abbreviated as GMT, is a time zone designation rather than a time standard. Time difference between time zones can be expressed by the GMT or UTC hour difference. In the UTC standard, there is a commitment to keep within 0.9 seconds of GMT, so that every few years a leap second is applied to UTC. In the age of the internet, these small clock calibrations are conveniently distributed via NTP.
There are no regions using timezone: GMT-9