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.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. Cities Countries GMT time UTC time AM and PM. Our Time Zone Map shows all current time zones. Official Berlin timezone and time change dates for year 2024. Business Date to Date (exclude holidays).Swatch even invented a concept called beat time that split each day into 1,000 beats on a decimal system, eradicating time zones entirely.įor those of you who don't operate on Internet Time, this spreadsheet shows the time zone in 195 countries, extracted from our World Factfiles series. The development of the world wide web in the 1990s led to calls for a standardised internet time, as people in cyberspace were no longer bound by geography. The time convention begins with Universal Coordinated Time (UTC) which is also commonly referred to as Greenwich Mean Time (GMT) being located at the Greenwich. Kiribati even extended its time zone 600 miles east in 1995, to include Caroline Island in the same zone (and, as it straddled the Date Line opposite the GMT meridian, the same date) as the country's other islands. Therefore, the difference in time for other countries is indicated either by adding or subtracting hours from GMT time. Other time zones are counted to the east and west of this line, either plus or minus hours from GMT.Įach country sets its own time zone within this framework, so some zones extend beyond the meridian for convenience, while others, like India, take on half hours. The implementation of Greenwich Mean Time (GMT) was the first step to determine the time zone of other countries in regard to GMT+0. The prime meridian, determined by the 1884 conference, runs through Greenwich, in the UK, giving us Greenwich Mean Time. The zones are based on 24 longitudinal meridian lines that run from the north to south poles. The Meridian Conference in 1884, attended by representatives from various countries, led to the creation of the 24 time zones we use today. Increasing globalisation in the Victorian era meant a need to standardise time zones, as businesses began to operate across wider areas and world travel became easier with the advent of the railway.
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