There are time zone differences based on time offsets from Universal Time Coordinated (UTC), which has been internationally adopted. The world is divided into 24 time zones, and neighboring time zones have a one-hour time difference, so that they correspond to the rotation of the earth which makes one full rotation in 24 hours (1 day). In some regions of the world, daylight saving time is individually observed.
Daylight saving time, being defined as time difference +1 hour, is a system that advances the time by 1 hour during summer time to prolong the daylight hours.
|
Names of the cities |
Time difference from Universal Time Coordinated (UTC) |
Time difference from Japan Standard Time (JST) |
Other cities in the same region |
|---|---|---|---|
|
Tokyo |
+9 hours |
0 hours |
Seoul, Pyongyang |
|
Beijing |
+8 hours |
-1 hour |
Hong Kong, Singapore |
|
Bangkok |
+7 hours |
-2 hours |
Jakarta |
|
Dacca |
+6 hours |
-3 hours |
|
|
Karachi |
+5 hours |
-4 hours |
|
|
Dubai |
+4 hours |
-5 hours |
|
|
Jeddah |
+3 hours |
-6 hours |
Baghdad |
|
Cairo |
+2 hours |
-7 hours |
|
|
|
+1 hour |
-8 hours |
|
|
|
0 hours |
-9 hours |
|
|
|
-1 hour |
-10 hours |
|
|
Rio de Janeiro |
-3 hours |
-12 hours |
|
|
Santo Domingo |
-4 hours |
-13 hours |
|
|
|
-5 hours |
-14 hours |
|
|
|
-6 hours |
-15 hours |
|
|
|
-7 hours |
-16 hours |
|
|
|
-8 hours |
-17 hours |
|
|
|
-9 hours |
-18 hours |
|
|
Honolulu |
-10 hours |
-19 hours |
|
|
Midway Island |
-11 hours |
-20 hours |
|
|
|
+12 hours |
+3 hours |
|
|
Nouméa |
+11 hours |
+2 hours |
|
|
|
+10 hours |
+1 hour |
Guam |
Regions marked with 
use daylight saving
time
The time zone differences of each region and use of daylight saving time are based on data as of January 2023. These are subject to change according to the governments of the respective countries or regions.