Time (metadata)

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Under some metadata standards, time is a representation term used to specify a time of day in the ISO 8601 time format.

Metadata data about data

Metadata is "data [information] that provides information about other data". Many distinct types of metadata exist, among these descriptive metadata, structural metadata, administrative metadata, reference metadata and statistical metadata.

A representation term is a word, or a combination of words, that semantically represent the data type of a data element. A representation term is commonly referred to as a class word by those familiar with data dictionaries. ISO/IEC 11179-5:2005 defines representation term as a designation of an instance of a representation class As used in ISO/IEC 11179, the representation term is that part of a data element name that provides a semantic pointer to the underlying data type. A Representation class is a class of representations. This representation class provides a way to classify or group data elements.

Note that Time should not be confused with the DateAndTime representation term which requires that both the date and time to be supplied.

Metadata registries that use the time representation term

See also

ISO/IEC 11179 is an international standard for representing metadata for an organization in a metadata registry.

ISO 8601Data elements and interchange formats – Information interchange – Representation of dates and times is an international standard covering the exchange of date- and time-related data. It was issued by the International Organization for Standardization (ISO) and was first published in 1988. The purpose of this standard is to provide an unambiguous and well-defined method of representing dates and times, so as to avoid misinterpretation of numeric representations of dates and times, particularly when data are transferred between countries with different conventions for writing numeric dates and times.

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A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "24 March 2019" is ten days after "14 March 2019" in the Gregorian calendar. The date of a particular event depends on the observed time zone. For example, the air attack on Pearl Harbor that began at 7:48 a.m. Hawaiian time on December 7, 1941, took place at 3:18 a.m. December 8 in Japan.

In metadata, the term data element is an atomic unit of data that has precise meaning or precise semantics. A data element has:

  1. An identification such as a data element name
  2. A clear data element definition
  3. One or more representation terms
  4. Optional enumerated values Code (metadata)
  5. A list of synonyms to data elements in other metadata registries Synonym ring

The 24-hour clock is the convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours, indicated by the hours passed since midnight, from 0 to 23. This system is the most commonly used time notation in the world today, and is used by international standard ISO 8601.

Timestamp sequence of characters or encoded information identifying when a certain event occurred

A timestamp is a sequence of characters or encoded information identifying when a certain event occurred, usually giving date and time of day, sometimes accurate to a small fraction of a second. The term derives from rubber stamps used in offices to stamp the current date, and sometimes time, in ink on paper documents, to record when the document was received. Common examples of this type of timestamp are a postmark on a letter or the "in" and "out" times on a time card.

A representation term is a word, or a combination of words, used as part of a data element name. Representation class is sometimes used as a synonym for representation term.

In metadata, the term date is a representation term used to specify a calendar date in the Gregorian calendar. Many data representation standards such as XML, XML Schema, Web Ontology Language specify that ISO date format ISO 8601 should be used.

ISO 2014 is an international standard that was issued in April 1976, and superseded by ISO 8601 in June 1988. ISO 2014 was the standard that originally introduced the all-numeric date notation [YYYY]-[MM]-[DD] with the digits in order starting with the most significant digit first. It was technically identical to ISO Recommendation R 2014 from 1971.

ISO 2015 is a standard of the International Organization for Standardization (ISO), superseded by ISO standard ISO 8601. The standard ISO week numbering system was introduced in ISO 2015. ISO 2015 was issued as an international standard in 1976, technically identical to ISO Recommendation R 2015, from 1971.

ISO 2711 is an ISO standard describing formats for ordinal dates. It was issued in 1973, and was superseded by ISO 8601 in June 1988.

ISO 3307 is an international standard for date and time representations issued by the International Organization for Standardization (ISO). The standard was issued in 1975, then was superseded by ISO 8601 in 1988.

ISO 4031 is an international standard first issued in 1978 by the International Organization for Standardization. It defined the representation of local time differentials, commonly referred to as time zones. It has since been superseded by a newer standard, ISO 8601. This newer standard sets out the current formats for local time differentials and so ISO 4031 is no longer in use.

Date and time notation around the world varies.

The European Committee for Standardization (CEN) and European Committee for Electrotechnical Standardization (CENELEC) adopted ISO 8601 with EN 28601, now EN ISO 8601. As a European Norm, CEN and CENELEC member states are obligated to adopt the standard as national standard without alterations as well.

South Africa signed up to use ISO 8601 for date and time representation through national standard ARP 010:1989 in 1998. The most recent South African Bureau of Standards standard SANS 8601:2009 "... is the identical implementation of ISO 8601:2004, and is adopted with the permission of the International Organization for Standardization" and was reviewed in 2016.

The Cloud Data Management Interface (CDMI) is a SNIA standard that specifies a protocol for self-provisioning, administering and accessing cloud storage.

ISO/IEC 19788 Information technology – Learning, education and training – Metadata for learning resources is a multi-part standard prepared by subcommittee SC36 of the Joint Technical Committee ISO/IEC JTC1, Information Technology for Learning, Education and Training. This committee was created to deal with the consequences of substantial overlap in areas of standardization done at the International Organization for Standardization (ISO) and the International Electrotechnical Commission.

A GeneralizedTime is a time format in the ASN.1 notation. It consists of a string value representing the calendar date, as defined in ISO 8601, a time of day with an optional fractional seconds element and the optional local time differential factor as defined in ISO 8601.