The term time zone is often used instead of local time. The areas that don't use DST remain on standard time zone all year.įor example, California uses Pacific Daylight Time (PDT) during the DST period, but Pacific Standard Time (PST) during the rest of the year. The words “daylight” or “summer” are then usually included in the time zone name. Regions that use Daylight Saving Time (DST) change the time zone name and time during the DST period. This makes the total number of time zones worldwide much higher. Also, the International Date Line (IDL), creates 3 time zones and several time zones are only 30 and 45 minutes apart. However, the actual borders on the time zone map have been drawn to match up with both internal and international borders, and rarely match up exactly with the 15-degree longitudes. If each time zone were 1 hour apart, there would be 24 in the world. Interactive Time Zone Map More Than 24 Time Zones The offset is expressed as either UTC- or UTC+ and the number of hours and minutes. UTC time changes 1 hour forward and backward corresponding to a 1-hour difference in mean solar time for every 15 degrees east or west of the prime meridian (0° longitude) in Greenwich, London, United Kingdom. The local time within a time zone is defined by its offset (difference) from Coordinated Universal Time (UTC), the world's time standard.
Business Date to Date (exclude holidays)Īt we define a time zone as a region where the same standard time is used.
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