![]() ![]() ![]() 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).Since 2020 Yukon uses UTC-7h or Yukon Standard Time all year round. Southampton Island remains on Eastern Standard time all year long. Nunavut covers 3 time zones and all zones change at 02:00 local time. Areas around Lloydminster are in the Mountain Time zone and change at 2:00 a.m. Most of Saskatchewan uses Central Standard time all year round. The areas of Ontario, west of 90° West longitude, are in the Central Time zone and change at 2:00 a.m. Return to first footnote 2 referrer Footnote 3 Some areas of Quebec east of 63° West longitude use Atlantic Time for all or part of the year. Prior to November 2011, Newfoundland changed time at 00:01 local time. (This has been denoted as serial number #07 as is transmitted in CHU code.) Province/Territory The time zone maps and the dates listed below have been in effect since 2020. Exceptions may exist in certain municipalities. When does daylight saving time start and end?ĭaylight saving time in Canada is determined by provincial legislation. These boundaries and changeover dates have serial number 07, broadcast in computer readable form on short wave station CHU along with Canada's official time reference UTC (NRC): Coordinated Universal Time, the modern implementation of Greenwich Time.Ī major change in official time practice will be given a new serial number and documented here. Starting in 2007, clocks following the new North American standard for Daylight Saving Time are to be turned forward by one hour on the second Sunday in March and turned back on the first Sunday of November. ![]() In Canada, Time Zones and Daylight Saving Time usually have been regulated by provincial and territorial governments. The times for the start and end of Daylight saving time in Canadian time zones can be found here. ![]()
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