- Are GMT and UTC the same time?
- For most everyday purposes, yes — GMT and UTC show the same time. The technical difference is in how they are defined: GMT is based on the Earth's rotation relative to the sun, while UTC is based on atomic clocks with occasional leap second adjustments.
- Which should I use, GMT or UTC?
- For technical, scientific, and international contexts, use UTC — it is the modern global standard. GMT is still commonly used in everyday speech, particularly in the UK and West Africa. For scheduling across time zones, UTC is preferred because it is unambiguous.
- Does the UK use GMT all year?
- No. The UK uses GMT (UTC+0) during winter and British Summer Time (BST, UTC+1) during summer. So "London time" is not always the same as GMT.
