Geography
Time Zones of the World Quiz
From UTC to the International Date Line — how well do you understand time zones?
From UTC to the International Date Line — how well do you understand time zones?
China spans roughly 5,200 kilometers east to west and crosses five geographic time zones, yet uses only one official time (UTC+8). Russia, by contrast, is divided into 11 time zones — the most of any contiguous country — while the International Date Line zigzags along the 180° meridian to keep island nations on consistent calendars.
Each round presents 10 randomized questions from a pool of 50, with four multiple-choice options and instant feedback after every answer. Your final score comes with a performance tier and shareable results.
You'll explore the shift from GMT to UTC as the international standard, unusual offsets like Nepal's UTC+5:45 and the Chatham Islands' UTC+12:45, Samoa's 2011 jump across the Date Line, the origins of daylight saving time, and how 19th-century railways pushed the world toward standardized timekeeping.
In 1949, the Communist government unified China under a single time zone (UTC+8, Beijing time) to promote national cohesion and simplify governance. The decision overrode the five geographic zones the country naturally spans, which can mean sunrise as late as 10 a.m. in far-western Xinjiang.
The International Date Line is an imaginary north-south line roughly along the 180° meridian in the Pacific Ocean where the date changes by one day. Crossing it westward advances the date by a day; crossing eastward moves it back a day. The line zigzags to keep island groups like Kiribati and Samoa on a single calendar day.
France technically has 12 time zones when its overseas territories are counted — the most of any country in the world. Among contiguous landmasses, Russia leads with 11 time zones stretching from Kaliningrad (UTC+2) to Kamchatka (UTC+12).
Last updated: April 2026