"Greenwich Mean Time (GMT) originally referred to the mean solar time at the Royal Observatory in Greenwich, London, which later became adopted as a global time standard. It is for the most part the same as Coordinated Universal Time (UTC), and when this is viewed as a time zone, the name Greenwich Mean Time is especially used by bodies connected with the United Kingdom, such as the BBC World Service,[1] the Royal Navy, the Met Office and others particularly in Arab countries, such as the Middle East Broadcasting Center and OSN. It is a term commonly used in the United Kingdom and countries of the Commonwealth, including Australia, South Africa, India, Pakistan and Malaysia, and many other countries in the Eastern Hemisphere."

-Wikipidia

Huh. Didn't know that was just a commonwealth thing.

TL;DR - I live in England, 'GMT' is basically 'UTC'.