PREMIS Data Dictionary for Preservation Metadata - version 3.0 Nov. 2015. Official web page

Semantic Units of the PREMIS Data Dictionary

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in the OWL Ontology ver. 1 is defined as:
FunctionalProperty hasEventDateTime

Containers	Current
2 - Event	2.3 eventDateTime

Semantic unit	2.3 eventDateTime
Definition	The single date and time, or date and time range, at or during which the Event occurred.
Obligation	Mandatory
Repeatability	Not repeatable
Data constraint	To aid machine processing, value should use a structured form. To facilitate exchange of PREMIS-conformant metadata, use of standard conventions, for instance as used in the date elements in the PREMIS schema, is recommended.
Usage notes	Recommended practice is to record the most specific time possible and to designate the time zone.
Examples	20050704T071530-0500 [July 4, 2005 at 7:15:30 a.m. EST] 2006-07-16T19:20:30+01:00 20050705T0715-0500/20050705T0720-0500 [from 7:15 a.m. EST to 7:20 a.m. EST on July 4, 2005] 2004-03-17 [March 17, 2004, only the date is known]