![]() It comes from the nautical system in which each time zone was assigned a letter. The "Z" is for "zero", and "Zulu" is the two-way radio pronunciation of "Z". UTC is also sometimes called Z or Zulu time. GMT (Greenwich Mean Time) is nearly synonymous, named after the Royal Observatory located in the Greenwich area of London, but its definitions have varied over time and may vary slightly by context. Like as the waves make towards the pebbled shoreĪlthough many time zones have descriptive names used by people in them, they are least ambiguously identified by their relationship to UTC (Universal Time, Co-ordinated). For extreme sunrise and sunset times, occurring in the far north and south, see also Midnight sun. Below is also a list of countries, regions, and territories grouped by time zone. This article discusses most of those issues. The official local time affects opening hours, but for outdoor activities you may need to also consider when it is morning or noon according to the sun. Watches and smartphones may show a time different from the local one, friends may call in the middle of the night as it is afternoon at home, and the sun may rise at wall clock times you wouldn't expect. 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.Time zones and daylight hours affect travellers in many ways.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. However, Arizona's local time is always UTC-7, because there's no DST in Arizona, and they remain on standard time all year. 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. Our Time Zone Map shows all current time zones. Business Date to Date (exclude holidays). ![]()
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