World Timezone Quiz
10 quick questions about UTC offsets, daylight saving, and world timezones. See your score at the end — and share it if you dare.
Why Timezone Questions Are Trickier Than They Look
Most people can name their own timezone, but the underlying rules trip up even frequent travelers. Offsets aren't always whole hours — India and Sri Lanka sit at UTC+5:30, and Nepal uses the unusual UTC+5:45. Daylight saving isn't decided per timezone either; it's decided per country, and sometimes per region within one, which is why Queensland stays on AEST year-round while the rest of eastern Australia shifts to AEDT every summer. And a single country can span wildly different numbers of zones for reasons that are more political than geographic — Russia officially uses 11, while China uses just 1 despite a landmass wide enough to naturally span about 5.
None of this is guesswork on this site — every live clock and conversion here reads directly from the same IANA timezone database browsers and operating systems use, so the daylight-saving status you see is never a hand-typed fact that can go stale. If a question below stumps you, our World DST Tracker and Day & Night Map are good places to build the intuition back up.
Frequently Asked Questions
What's the difference between a timezone and a UTC offset?
A UTC offset is just a number, like UTC+5:30 — how far ahead of or behind Coordinated
Universal Time a clock is set. A timezone is a named region that follows a specific
offset (and, in many cases, a specific set of daylight-saving rules). Two places can
share the same offset right now but belong to different named timezones, and the same
named timezone can have two different offsets across the year if it observes daylight
saving.
Why do some timezones have 30 or 45 minute offsets instead of a full hour?
Most timezones are whole-hour offsets from UTC, but a handful split the difference for
geographic or political reasons. India and Sri Lanka use UTC+5:30, several Australian
and Canadian regions use half-hour offsets, and Nepal uses UTC+5:45 — one of only a few
45-minute offsets in the world. These usually reflect a country choosing a single
offset that sits closer to its true solar time than the nearest whole hour would.
Does every country in a timezone observe daylight saving the same way?
No — daylight saving is decided per country, and sometimes per region within a country,
not per timezone. New South Wales, Victoria, and Tasmania shift to daylight saving in
the Southern Hemisphere summer, while Queensland, on the same base timezone, opts out
and stays fixed year-round.
Why does the same UTC offset sometimes have a different name, like EST vs. CDT?
Abbreviations track the season, not just the offset. Eastern Time in the US is EST
(UTC-5) in winter and EDT (UTC-4) in summer. That's also why UTC-5 briefly lines up
with two different US timezones depending on the time of year: Eastern Standard Time
in winter and Central Daylight Time in summer both sit at UTC-5.