At 150 degrees west (or 150° W) longitude, the time should be 150 degrees divided by 15 degrees = 10 hours behind UTC, or UTC-10.1.4.1.1 Working with Date and Time Values that Require a Time Zone (and not a zone. You have to divide the longitude, in degrees, by 15 to find the appropriate time zone, in hours. A list of current W3C publications and the latest revision of this. This is also the reference point for Coordinated Universal Time (UTC) with 1 hour per 15 degrees longitude. There are two naming conflicts with time zones commonly used in the United States, CST and EST. 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. Australian time zones and their naming variants account for fully one quarter of all time zones in the PostgreSQL time zone lookup table. 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. Time Difference, Current Local Time and Date of the World's Time Zones.
Theoretically, each 1-hour time zone is 15 degrees wide, indicating a 1-hour difference in mean solar time. About Time Difference Look up the current local time and the date. 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. Time zones and UTC offsets International Date Line West, -11:00 Midway Island, -11:00 Hawaii, -10:00 Alaska, -09:00 Pacific Time (US & Canada), -08:00. 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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