ⓘ Time zones ..

Time zone

A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. Time zones tend to follow the boundaries of countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in close commercial or other communication to keep the same time. Most of the time zones on land are offset from Coordinated Universal Time UTC by a whole number of hours UTC−12:00 to UTC+14:00, but a few zones are offset by 30 or 45 minutes. Some higher latitude and temperate zone countries use daylight saving time for pa ...

Tz database

The tz database is a collaborative compilation of information about the worlds time zones, primarily intended for use with computer programs and operating systems. Paul Eggert is its current editor and maintainer, with the organizational backing of ICANN. The tz database is also known as tzdata, the zoneinfo database or IANA time zone database, and occasionally as the Olson database, referring to the founding contributor, Arthur David Olson. Its uniform naming convention for time zones, such as America/New_York and Europe/Paris, was designed by Paul Eggert. The database attempts to record ...

UTC offset

The UTC offset is the difference in hours and minutes from Coordinated Universal Time for a particular place and date. It is generally shown in the format ±. So if the time being described is one hour ahead of UTC, the UTC offset would be "+01:00", "+0100", or simply "+01". Every inhabited place in the world has a UTC offset that is a multiple of 15 minutes, and the majority of offsets as well as all nautical time zones are measured in whole hours. There are many cases where the national civil time ignoring Daylight Saving uses a UTC offset time zone that is different to the theoretical on ...

World clock

For World Clock which is actually an astronomical clock, see Jens Olsens World Clock A world clock is a clock which displays the time for various cities around the world. The display can take various forms: Light projection onto a map representing daytime, used in the Geochron, a brand of a particular form of world clock. A moving circular map of the world, rotating inside a stationary 24-hour dial ring. Alternatively, the disc can be stationary and the ring moving. The clock face can incorporate multiple round analogue clocks with moving hands or multiple digital clocks with numeric reado ...

List of military time zones

This is a list of military time zones as defined in the ACP 121 standard. It is used by many nations armed forces, particularly members of the Combined Communications Electronics Board. The names are identical to the NATO phonetic alphabet. Going east from the prime meridian at Greenwich, letters "Alfa" through "Mike" skipping "J", see below represent the 12 time zones with positive UTC offsets until reaching the international Date Line. Going west from Greenwich, letters "November" through "Yankee" represent zones with negative offsets. The system apparently originates from Nathaniel Bowd ...