There's this: http://dublincore.org/documents/dcmi-period/
For cultural heritage (where we need to be concerned about granularity of definition and vagueness) there's the CRM ontology's Period class, as we at the British Museum use as here: http://collection.britishmuseum.org/resource/crm/E4_Period Barry ---------- Forwarded message ---------- From: Svensson, Lars <l.svens...@dnb.de> Date: Tue, Nov 12, 2013 at 2:47 PM Subject: Which datatype to use for time intervals To: "'public-lod@w3.org' (public-lod@w3.org)" <public-lod@w3.org> Is there a standard (recommended) datatype to use when I want to specify a time interval (e. g. 2013-11-13--2013-11-14)? The XML Schema types [1] don't include a time interval format (unless you want to encode it as starting time + duration). There seems to be a way to encode it using ISO 8601, the Wikipedia says that intervals can be expressed as 'Start and end, such as "2007-03-01T13:00:00Z/2008-05-11T15:30:00Z"' [2], but I haven't found a formally defined datatype to use with RDF data. [1] www.w3.org/TR/xmlschema-2/ [2] http://en.wikipedia.org/wiki/ISO_8601#Time_intervals Thanks for any help, Lars