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Unix time

Index Unix time

Unix time (also known as POSIX time or UNIX Epoch time) is a system for describing a point in time, defined as the number of seconds that have elapsed since 00:00:00 Coordinated Universal Time (UTC), Thursday, 1 January 1970,. [1]

74 relations: A Deepness in the Sky, Age of the universe, Apollo 11, Atomic clock, Binary number, Bit, Brady Haran, C date and time functions, C standard library, Chinese calendar, Civil time, Classification of discontinuities, Composite data type, Computer keyboard, Continuous function, Coordinated Universal Time, Corel, David L. Mills, Decimal, Email, Epoch (reference date), Fixed-point arithmetic, Freenode, Friday the 13th, Google, Google Doodle, Greenwich Mean Time, Gregorian calendar, Hebrew calendar, Hertz, Integer, Integer (computer science), Integer overflow, International Atomic Time, International Date Line, International System of Units, Internet Relay Chat, Iranian calendars, Islamic calendar, ISO 8601, Julian calendar, KDE, Kontact, Landon Curt Noll, Leap second, Leap year, Linux, Long and short scales, Lords of the Night, Maya calendar, ..., Millennium, Network Time Protocol, New Year, Portmanteau, POSIX, QNX, Real number, Scalar (mathematics), Second, Software archaeology, Synchronization, System time, The Open Group, Time, Timeline of the far future, Tz database, Universal Time, Unix, Unix-like, Usenet, Vernor Vinge, WordPerfect, Year 2038 problem, 2,147,483,647. Expand index (24 more) »

A Deepness in the Sky

A Deepness in the Sky is a science fiction novel by American writer Vernor Vinge.

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Age of the universe

In physical cosmology, the age of the universe is the time elapsed since the Big Bang.

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Apollo 11

Apollo 11 was the spaceflight that landed the first two humans on the Moon.

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Atomic clock

An atomic clock is a clock device that uses an electron transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element.

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Binary number

In mathematics and digital electronics, a binary number is a number expressed in the base-2 numeral system or binary numeral system, which uses only two symbols: typically 0 (zero) and 1 (one).

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Bit

The bit (a portmanteau of binary digit) is a basic unit of information used in computing and digital communications.

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Brady Haran

Brady John Haran (born 18 June 1976) is an Australian-born British independent filmmaker and video journalist who is known for his educational videos and documentary films produced for BBC News and his YouTube channels, the most notable being Periodic Videos and Numberphile.

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C date and time functions

The C date and time functions are a group of functions in the standard library of the C programming language implementing date and time manipulation operations.

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C standard library

The C standard library or libc is the standard library for the C programming language, as specified in the ANSI C standard.

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Chinese calendar

The traditional Chinese calendar (official Chinese name: Rural Calendar, alternately Former Calendar, Traditional Calendar, or Lunar Calendar) is a lunisolar calendar which reckons years, months and days according to astronomical phenomena.

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Civil time

In modern usage, civil time refers to statutory time scales designated by civilian authorities, or to local time indicated by clocks.

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Classification of discontinuities

Continuous functions are of utmost importance in mathematics, functions and applications.

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Composite data type

In computer science, a composite data type or compound data type is any data type which can be constructed in a program using the programming language's primitive data types and other composite types.

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Computer keyboard

In computing, a computer keyboard is a typewriter-style device which uses an arrangement of buttons or keys to act as mechanical levers or electronic switches.

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Continuous function

In mathematics, a continuous function is a function for which sufficiently small changes in the input result in arbitrarily small changes in the output.

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Coordinated Universal Time

No description.

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Corel

No description.

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David L. Mills

David L. Mills (born June 3, 1938) is an American computer engineer and Internet pioneer.

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Decimal

The decimal numeral system (also called base-ten positional numeral system, and occasionally called denary) is the standard system for denoting integer and non-integer numbers.

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Email

Electronic mail (email or e-mail) is a method of exchanging messages ("mail") between people using electronic devices.

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Epoch (reference date)

In the fields of chronology and periodization, an epoch is an instant in time chosen as the origin of a particular era.

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Fixed-point arithmetic

In computing, a fixed-point number representation is a real data type for a number that has a fixed number of digits after (and sometimes also before) the radix point (after the decimal point '.' in English decimal notation).

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Freenode

Freenode, formerly known as Open Projects Network, is an IRC network used to discuss peer-directed projects.

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Friday the 13th

Friday the 13th is considered an unlucky day in Western superstition.

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Google

Google LLC is an American multinational technology company that specializes in Internet-related services and products, which include online advertising technologies, search engine, cloud computing, software, and hardware.

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Google Doodle

A Google Doodle is a special, temporary alteration of the logo on Google's homepages that commemorates holidays, events, achievements, and people.

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Greenwich Mean Time

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London.

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Gregorian calendar

The Gregorian calendar is the most widely used civil calendar in the world.

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Hebrew calendar

The Hebrew or Jewish calendar (Ha-Luah ha-Ivri) is a lunisolar calendar used today predominantly for Jewish religious observances.

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Hertz

The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.

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Integer

An integer (from the Latin ''integer'' meaning "whole")Integer 's first literal meaning in Latin is "untouched", from in ("not") plus tangere ("to touch").

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Integer (computer science)

In computer science, an integer is a datum of integral data type, a data type that represents some range of mathematical integers.

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Integer overflow

In computer programming, an integer overflow occurs when an arithmetic operation attempts to create a numeric value that is outside of the range that can be represented with a given number of bits – either larger than the maximum or lower than the minimum representable value.

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International Atomic Time

International Atomic Time (TAI, from the French name temps atomique international) is a high-precision atomic coordinate time standard based on the notional passage of proper time on Earth's geoid.

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International Date Line

The International Date Line (IDL) is an imaginary line of demarcation on the surface of Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next.

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International System of Units

The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.

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Internet Relay Chat

Internet Relay Chat (IRC) is an application layer protocol that facilitates communication in the form of text.

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Iranian calendars

The Iranian calendars (گاه‌شماری ایرانی Gâhshomâriye Irâni) are a succession of calendars invented or used for over two millennia in Iran (Persia).

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Islamic calendar

The Islamic, Muslim, or Hijri calendar (التقويم الهجري at-taqwīm al-hijrī) is a lunar calendar consisting of 12 months in a year of 354 or 355 days.

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ISO 8601

ISO 8601 Data elements and interchange formats – Information interchange – Representation of dates and times is an international standard covering the exchange of date- and time-related data.

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Julian calendar

The Julian calendar, proposed by Julius Caesar in 46 BC (708 AUC), was a reform of the Roman calendar.

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KDE

KDE is an international free software community that develops Free and Open Source based software.

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Kontact

Kontact is a personal information manager and groupware software suite developed by KDE.

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Landon Curt Noll

Landon Curt Noll (born October 28, 1960) is an American computer scientist, co-discoverer of the 25th Mersenne prime and discoverer of the 26th, which he found while still enrolled at Hayward High School and concurrently at California State University, Hayward.

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Leap second

A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time as realized by UT1.

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Leap year

A leap year (also known as an intercalary year or bissextile year) is a calendar year containing one additional day (or, in the case of lunisolar calendars, a month) added to keep the calendar year synchronized with the astronomical or seasonal year.

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Linux

Linux is a family of free and open-source software operating systems built around the Linux kernel.

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Long and short scales

The long and short scales are two of several large-number naming systems for integer powers of ten that use the same words with different meanings.

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Lords of the Night

In Mesoamerican mythology the Lords of the Night (Yoalteuctin) are a set of nine gods who each ruled over every ninth night forming a calendrical cycle.

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Maya calendar

The Maya calendar is a system of calendars used in pre-Columbian Mesoamerica and in many modern communities in the Guatemalan highlands, Veracruz, Oaxaca and Chiapas, Mexico.

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Millennium

A millennium (plural millennia or, rarely, millenniums) is a period equal to 1000 years, also called kiloyears.

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Network Time Protocol

Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks.

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New Year

New Year is the time or day at which a new calendar year begins and the calendar's year count increments by one.

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Portmanteau

A portmanteau or portmanteau word is a linguistic blend of words,, p. 644 in which parts of multiple words or their phones (sounds) are combined into a new word, as in smog, coined by blending smoke and fog, or motel, from motor and hotel.

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POSIX

The Portable Operating System Interface (POSIX) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems.

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QNX

QNX is a commercial Unix-like real-time operating system, aimed primarily at the embedded systems market.

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Real number

In mathematics, a real number is a value of a continuous quantity that can represent a distance along a line.

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Scalar (mathematics)

A scalar is an element of a field which is used to define a vector space.

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Second

The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.

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Software archaeology

Software archaeology or software archeology is the study of poorly documented or undocumented legacy software implementations, as part of software maintenance.

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Synchronization

Synchronization is the coordination of events to operate a system in unison.

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System time

In computer science and computer programming, system time represents a computer system's notion of the passing of time.

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The Open Group

The Open Group is an industry consortium that seeks to "enable the achievement of business objectives" by developing "open, vendor-neutral technology standards and certifications".

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Time

Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future.

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Timeline of the far future

While predictions of the future can never be absolutely certain, present understanding in various scientific fields allows for the prediction of far-future events, if only in the broadest outline.

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Tz database

The tz database is a collaborative compilation of information about the world's time zones, primarily intended for use with computer programs and operating systems.

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Universal Time

Universal Time (UT) is a time standard based on Earth's rotation.

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Unix

Unix (trademarked as UNIX) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, development starting in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.

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Unix-like

A Unix-like (sometimes referred to as UN*X or *nix) operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified to any version of the Single UNIX Specification.

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Usenet

Usenet is a worldwide distributed discussion system available on computers.

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Vernor Vinge

Vernor Steffen Vinge (born October 2, 1944) is an American science fiction author and retired professor.

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WordPerfect

WordPerfect (WP) is a word processing application owned by Corel with a long history on multiple personal computer platforms.

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Year 2038 problem

The Year 2038 problem relates to representing time in many digital systems as number of seconds passed since 1 January 1970 and storing it as a signed 32-bit integer.

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2,147,483,647

The number 2,147,483,647 is the eighth Mersenne prime, equal to 231 − 1.

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Redirects here:

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References

[1] https://en.wikipedia.org/wiki/Unix_time

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