What does GMT
mean?

GMT is an abbreviation for Greenwich Mean Time - the time zone London can be found in. And as the gold price is 'calculated/fixed/traded' in London GoldPriceOne uses GMT for the time of the current price.

If you live west of London your local time is earlier than GMT. Living east of London and your local time is later than GMT. But that doesn't really matter for the current price shown in the app. Wherever you live, whatever your local time is, the price shown is what one ounce of fine gold is worth currently on the planet.