International Date Line Calculator

World Time Calculator

This calculator is designed to show the current time in various countries around the world and to compare these times with your local time and Greenwich Mean Time (GMT).

GMT is also known as Universal Time (UTC), World Time and Zulu Time.

  1. The most popular locations are shown in the main table.
  2. For other locations, click on a country or city in the box in the lower right corner to check the current time in that location. You can check the time in over 70 countries or cities worldwide.

  1. Daylight Saving Time: (also called Summer Time in many countries) is a system to get more out of summer days by setting clocks one hour forward during the summer months. In this way, the sun appears to rise one hour later in the morning when people are usually asleep, giving the benefit of one more hour of daylight during waking hours. The sunset and sunrise are one hour later than during normal time.
  2. Universal Time (UTC): Since radio signals can cross multiple time zones and the international date line, some worldwide standard for time and date is needed. This standard is Coordinated Universal Time, abbreviated to UTC and was formerly known as Greenwich Mean Time (GMT). Today, UTC uses precise atomic clocks, shortwave time signals, and satellites to ensure that UTC remains a reliable, accurate standard for scientific and navigational purposes. Despite the improvements in accuracy, however, the same principles used in GMT have been carried over into UTC. Other terms used to refer to it include "Zulu Time" and "World Time".
  3. Greenwich Mean Time (GMT) was based upon the time at the zero degree meridian that crossed through Greenwich, England. GMT became a world time and date standard because it was used by Britain's Royal Navy and merchant fleet during the nineteenth century, however it is now known as Universal Time.
  4. Zulu Time is the military term for UTC or GMT, named for the "Z" often used after UTC times.
  5. It is important to note that these time standards don't change for daylight savings time.
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