It helps to make the daylight duration longer in summer by setting clock 1 hour forward in the spring (start of DST period) and setting them 1 hour backward in autumn when the DST period is over. The Daylight Saving Time (DST) is widely used in Europe and North America, and also in some parts of Africa, Australia, South America. The countries with multiple time zones in the mainland area (some of them also have the insular territories) are Russia, USA, Canada, Australia, Mexico, Brazil, Indonesia, Kazakhstan, Mongolia, the Democratic Republic of the Congo, Kiribati, Micronesia, Chile, Spain, Portugal, and Ecuador. The situation is the same in the United Kingdom, Denmark, New Zealand, Netherlands. Zulu Time Zone is also commonly used at sea between longitudes 7.5 West and 7.5 East. Where and When is Z Observed Zulu Time Zone is often used in aviation and the military as another name for UTC +0. There are independent states with multiple time zones, and the record-holder is France with 12 zones, but 11 of them are used in overseas areas and only one in the country's mainland. Zulu Time Zone (Z) has no offset from Coordinated Universal Time (UTC). This time zone is in use during standard time in: Europe, Africa, North America, Antarctica. Greenwich Mean Time (GMT) has no offset from Coordinated Universal Time (UTC). At 75 degrees east (or 75° E) longitude, the time would be 75 degrees divided by 15 degrees = 5 hours ahead of UTC, or UTC+5.īelow are all the different local times currently in use worldwide.All the observed world time zones are listed by country (or territory) in the table below. Greenwich Mean Time GMT Time Zone / Coordinated Universal Time.At 150 degrees west (or 150° W) longitude, the time should be 150 degrees divided by 15 degrees = 10 hours behind UTC, or UTC-10.You have to divide the longitude, in degrees, by 15 to find the appropriate time zone, in hours. This is also the reference point for Coordinated Universal Time (UTC) with 1 hour per 15 degrees longitude. Defined by UTC OffsetĮvery place on Earth is measured in terms of its distance east or west of the prime meridian (0° longitude) in Greenwich, London, United Kingdom. Some geographically large (wide) countries, like India and China, use only 1 time zone, while it would have been natural to expect several, like in the US or Australia. The actual borders on a time zone map have been drawn to correspond with both internal and international borders, and rarely match up exactly with the 15-degree time zone borders. This can be seen as the white and gray stripes on our Time Zone Map and in the image above. Theoretically, each 1-hour time zone is 15 degrees wide, indicating a 1-hour difference in mean solar time. It is 1 hour ahead of the modern-day time standard, Coordinated Universal Time (UTC). By advancing clocks across the country by 6 minutes and 32 seconds in 1893, Germany entered the time zone it still uses today. However, Arizona's local time is always UTC-7, because there's no DST in Arizona, and they remain on standard time all year. In Berlin, this was 53 minutes and 28 seconds ahead of Greenwich Mean Time (GMT), which was then the world's time standard. ![]() The reason it may be confusing is that California's local time during DST is UTC-7, but the standard time in California is UTC-8. For instance, during DST, it is common to say “California and Arizona are now in the same time zone.” However, the correct thing to say would be: “California and Arizona now have the same local time.” The term time zone is often confused with local time. The words “daylight” or “summer” are then usually included in the name, and the local time is usually set forward 1 hour.įor example, California uses Pacific Daylight Time (PDT) during the DST period with a UTC offset of UTC-7, but Pacific Standard Time (PST) with an offset of UTC-8 during the rest of the year. ![]() Daylight Saving Time Zonesĭuring Daylight Saving Time (DST) the time zone name and time changes. Also, several time zones are only 30 or 45 minutes apart, increasing the total number of standard time zones even further. ![]() However, the International Date Line (IDL) creates 3 more. If each time zone were 1 hour apart, there would be 24 in the world. World Time Buddy (WTB) is a convenient world clock, a time zone converter, and an online meeting. Our Time Zone Map shows all current time zones. Business Date to Date (exclude holidays) GMT-12 is 12 hours behind Greenwich Mean Time (GMT).
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