Time Zone Map of the World

Map of World Time Zones

Time Zones in North America

The following table lists the North American time zone abbreviations.

Time Zones in Australia

The following table lists the Australian time zone abbreviations.

Time Zones in Europe

The following table lists the European time zone abbreviations.

The term “IST” is not the legal abbreviation to describe Irish Summer Time but it is commonly used. IST is described as “summer time”, according to Irish law, while Irish Standard Time is described as both “standard time” and “winter time”.

Military / NATO / Letter Time Zones

The following table lists the Military time zone abbreviations.

The basis for this is Z – Zulu time – Zero meridian time – the same as UTC It’s a convention to assign letters to time zones, where Z= Zero meridian, and Zulu is the word that represents the letter Z, when it’s used in communication. It is sometimes used in the US Military and NATO in conjunction with 24 hour clocks, and is also popular to use in movies to reference time.

Other letters/words are used for other time zones than UTC, most based on the right or reverse order of the Alphabet. Note that ‘J’ is skipped (‘J’ – Juliet refers to current local time of the observer). There are 25 time zones defined here, but 26 letters in the English alphabet.

Index of Time Zone Acronyms and Abbreviations

Alphabetically sorted. Note that some of the abbreviations are not unique, these will have several entries in the list. Other time zones have many common names, and each of these will be listed as well.

The decrease in daylight during the winter months is due to Earth’s axial tilt of 23 degrees. If the Earth was not tilted on its axis, the length of day and night would remain steady year long. During winter in the northern hemisphere there are less daylight hours, and the southern hemisphere in turn has longer daylight hours and experiences summer.

The main purpose of Daylight Saving Time (called “Summer Time” in many places in the world) is to make better use of daylight. In Ireland we advance our clocks forward by one hour in Spring to maximise daylight for the summer months. This has the effect of moving an hour of daylight from the morning to the evening. In Winter the clocks are then changed back by one hour to maximise daylight during morning hours.

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