Every UTC offset currently in use worldwide, showing the live current time in each zone right now. From UTC−12 in the far Pacific to UTC+14 in Kiribati — updated every second.
A UTC offset is the difference in hours (and sometimes minutes) between a location's local time and Coordinated Universal Time (UTC). For example, UTC+5:30 means the local time is 5 hours and 30 minutes ahead of UTC — which is why India Standard Time uses this offset. UTC offsets range from UTC−12:00 to UTC+14:00, spanning 26 hours in total and covering all inhabited points on Earth.
Note that offsets shift seasonally in countries that observe Daylight Saving Time. For example, London uses UTC+0 (GMT) in winter but UTC+1 (BST) in summer. The cards above always show the current local time based on today's date and whether DST is currently active.
GMT (Greenwich Mean Time) is a time zone based on the mean solar time at the Royal Observatory in Greenwich, London. UTC (Coordinated Universal Time) is an atomic time standard maintained by a global network of atomic clocks. In everyday use the difference is less than one second, because UTC is occasionally adjusted with "leap seconds" to stay within 0.9 seconds of astronomical time.
For practical purposes — scheduling calls, checking clocks, setting appointments — GMT and UTC are identical. The scientific, aviation, and computing communities use UTC because it is based on atomic precision rather than the Earth's slightly irregular rotation. When you see a time listed as "GMT" in everyday conversation, it means exactly the same thing as "UTC."
In theory, 24 zones of exactly one hour each would divide the world neatly. In practice, countries have chosen offsets that reflect their geography and history. India (UTC+5:30) uses a half-hour offset because it sits midway between two full-hour zones and wanted a single national time. Nepal (UTC+5:45) uses a 15-minute increment to distinguish itself from India. Australia's Eucla region (UTC+8:45) has its own quirky offset for local historical reasons. The result is 38 distinct offsets — 11 of which involve fractional hours.