Coordinated Universal Time (UTC) came to replace GMT with the more accurate and scientific measurements of time1. Although the abbreviation does not match the term, it was used as a compromise for the translation from European languages. UTC differs from GMT due to 24-hour system, which starts counting from midnight.
Is the UK GMT or UTC?
The United Kingdom uses Greenwich Mean Time or Western European Time (UTC) and British Summer Time or Western European Summer Time (UTC+01:00).
Should I say GMT or UTC?
It's also based on atomic clocks and takes into account the necessary leap seconds every few years. GMT is a time zone. I'd always go with UTC, though, as you mention, as long as you're consistent ... Note: StackExchange goes with UTC.
