World time zone map

World Time Zone Map All Countries Islands Provinces States

world time zone map

The Time Zone Map gives an overview of current local times around the world. It takes into account daylight saving time (DST) changes.

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If each time zone were 1 hour apart, there would be 24 in the world. But several time zones have only 30 and 45 minutes offsets, making the total number worldwide much higher. Also, several time zones are only 30 or 45 minutes apart, increasing the total number of standard time zones even further. The term time zone is often confused with local time. Theoretically, each 1-hour time zone is 15 degrees wide, indicating a 1-hour difference in mean solar time.

Check world time and date for cities all over the world, the time difference, daylight saving time dates and time zone map. This advanced application is very helpful for travelers who need to know time difference around the world and want to be aware of world timezones they are traveling to, as well as for businesses which are located in international timezones and want to connect with their partners and customers. New features like the ability to add more clocks and set alarms were added recently and general usability was improved. Since January 1, , it has been defined to follow International Atomic Time TAI with an exact offset of an integer number of seconds, changing only when a leap second is added to keep clocks synchronized with the rotation of the Earth. Universal Time UT is the modern term for the international telescope-based system, adopted to replace "Greenwich Mean Time" in by the International Astronomical Union. Observations at the Greenwich Observatory itself ceased in , though the location is still used as the basis for the coordinate system. Because the rotational period of Earth is not perfectly constant, the duration of a second would vary if calibrated to a telescope-based standard like GMT or UT - in which a second was defined as a fraction of a day or year.

The worldwide standard for coordinated universal time is now abbreviated as UTC. The current UTC or Coordinated Universal Time , formerly known as GMT or Greenwich Mean Time is shown directly above the world map, and that starting time zone for worldwide time is indicated with a O in the olive green square at the bottom of the map. Excluding Daylight Saving Time when it applies , the numbers shown in each time zone left or right of UTC indicate the number of hours you should add or subtract to find the current time in your area of interest. To find out if a particular country, island, province, state or territory is currently using Daylight Saving Time, click on the applicable time zone map, shown to the right. For example, during Standard Time the U.

A time zone is a region of the globe that observes a uniform standard time for legal , commercial , and social purposes. Time zones tend to follow the boundaries of countries and their subdivisions because it is convenient for areas in close commercial or other communication to keep the same time. Some higher latitude and temperate zone countries use daylight saving time for part of the year, typically by adjusting local clock time by an hour. Many land time zones are skewed toward the west of the corresponding nautical time zones. This also creates a permanent daylight saving time effect.

The world time zone map uses a repeating color scheme to designate the different standard time zones observed in each country. Most countries do not adjust their time zone observance and when they do it most likely involves small boundary changes or changes in the observance of daylight saving time. The world time zone map indicates the standard time zones actually observed. In theory time zones are based on the division of the world into twenty four time zones of 15 degrees longitude each. Time zones to the east of the Greenwich meridian are later and times to the west of the Greenwich meridian are earlier. To see more detail view our larger format world time zone map.


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