Geographic time zones, the date line, and location-based time relationships.
Test your knowledge with these top questions!
China Standard Time is how many hours ahead of UTC?
Midnight UTC is 8 a.m. in China, and the clocks stay there year-round because China does not observe daylight saving time.
Why does official noon occur at the same moment across China, despite its wide east–west span?
China spans roughly five solar-time zones, so in western cities the sun may reach its highest point well after 12:00 on the official clock.
Which nation also uses UTC+8 as its standard time?
Singapore shares its clock time with Beijing and Hong Kong, which makes scheduling across major Asian business hubs simpler.
How many official time zones does China use nationwide?
China consolidated its five former time zones into one in 1949, setting the whole country to Beijing time.
Does Nepal change its clocks seasonally for daylight saving time?
Nepal’s clocks stay fixed year-round, even as the changing seasons shift the times of sunrise and sunset.
What is Nepal's standard time offset from UTC?
The 45-minute offset reflects Nepal’s longitude: Earth turns 15 degrees per hour, or about four minutes per degree.
What is the official time zone used across Nepal?
Nepal uses one clock nationwide, based on a meridian near Mount Gaurishankar rather than on Kathmandu alone.
Compared with India, what is Nepal's standard time difference?
India uses UTC+5:30, so crossing the long India–Nepal land border means moving your watch forward 15 minutes.
What is the name of the 0° longitude line that runs through Greenwich?
Longitude is measured east or west from the Prime Meridian; latitude instead measures north or south from the Equator.
In the usual time-zone system, how do places east of Greenwich compare with GMT?
Earth spins eastward, so sunrise and noon arrive earlier farther east—one reason eastward time zones are ahead.