The Bureau International des Poids et Mesures (BIPM) is the international organization on matters related to metrology. It maintains the International System of Units (SI) and the international reference time scale (UTC).

• second
• metre
• degree Celsius

Darwin Core is a standard maintained by the Darwin Core Maintenance Interest Group. The Darwin Core vocabulary including classes and their properties have been fully implemented on ther EU Pollinator Hub vocabulary. Terms in the namespace abbreviation dcterms: are imports of Dublin Core legacy terms from the /elements/1.1/ namespace into the Darwin Core vocabulary for use in describing biodiversity data. DCMI encourages the use of the /terms/ namespace and this policy has been followed on the EU Pollinator Hub.

Recommended practice is to use a controlled vocabulary such as the DCMI Type Vocabulary DCMI-TYPE. To describe the file format, physical medium, or dimensions of the resource, use the property Format.

• StillImage
• MovingImage
• Sound
• PhysicalObject
• Event
• Text

Darwin Core is a standard maintained by the Darwin Core Maintenance Interest Group. The Darwin Core vocabulary including classes and their properties have been fully implemented on ther EU Pollinator Hub vocabulary. Terms in the namespace abbreviation dcterms: are imports of Dublin Core terms from the /terms/ namespace into the Darwin Core vocabulary for use in describing biodiversity data. The Dublin Core namespace URI these terms is: http://purl.org/dc/terms/

According to the DCMI Metadata Terms Vocabulary recommended practice is to describe the date, date/time, or period of time as recommended for the property Date, of which this is a subproperty. According to Darwin Core standard recommended best practice is to use a date that conforms to ISO 8601-1:2019.

• 1963-03-08T14:07-0600 (8 Mar 1963 at 2:07pm in the time zone six hours earlier than UTC)
• 2009-02-20T08:40Z (20 February 2009 8:40am UTC)
• 2018-08-29T15:19 (3:19pm local time on 29 August 2018)
• 1809-02-12 (some time during 12 February 1809)
• 1906-06 (some time in June 1906)
• 1971 (some time in the year 1971)
• 2007-03-01T13:00:00Z/2008-05-11T15:30:00Z (some time during the interval between 1 March 2007 1pm UTC and 11 May 2008 3:30pm UTC)
• 1900/1909 (some time during the interval between the beginning of the year 1900 and the end of the year 1909)
• 2007-11-13/15 (some time in the interval between 13 November 2007 and 15 November 2007)

Recommended best practice is to use an IRI from the Library of Congress ISO 639-2 scheme.