Prime Meridian at Greenwich, London is the reference for every time zone in the world.
UTC is rectified every few years with leap seconds so that UTC never drifts further than two seconds away from GMT.
For most practical purposes, you can consider UTC and GMT as the same time.
Greenwichmeantime.com is now a web application. Navigation between pages is fast, and data downloaded to your device is reduced to a minimum as you navigate.
British Summer Time (BST) replaced GMT on 29 March. UK is on GMT only when Daylight Saving Time (DST) is not in use.
When is a good time to catch-up with family and friends? Need to schedule a business conference call? Use the GMT time tools.
Which countries do not use Daylight Saving Time?
Useful Gadgets
Imagine travelling to a different country, in a different part of the world, and waking up earlier or later, due to the time zone difference.
Bookmark the Sunrise gadget below and use it in conjunction with the Moon one.
The Moon Clock with timings for regular and Supermoons, and a Graeco-Roman Daylight chart, The Horae.
Read about Time
Explore the Articles section, from Lunar Calendars and A Shakespearean Theme to Definitions of Time.