and are used in aviation, at sea, and in telecommunications. These are named according to the NATO phonetic alphabet: Alpha, Bravo, Charlie, etc. There are also 25 military time zones which follow the rule of 1 hour per 15 degrees longitude. In Havana, Cuba, the standard time zone is also UTC-5, but it's called Cuba Standard Time (CST). The time zone names may be completely different, even though the UTC offset is the same.įor instance in Miami, Florida, is 5 hours behind UTC (UTC-5) and the standard time zone is Eastern Standard Time (EST). To confuse matters more, each time zone can have different local time zone names, usually linked to the geographical name of the country or region.
The formal name for Mountain Time in the US is either Mountain Standard Time or Mountain Daylight 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 is that California's local time during DST is UTC-7, but the standard time in California is minus one more hour: 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 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.
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