The issue was raised at https://joinup.ec.europa.eu/release/dcat-application-profile-data-portals-europe-final-draft#comment-14600
The datatypes for the the release date and modification date are set to be xsd:date range.
Portals like the EU ODP have more precise indications: therefore it uses xsd:DateTime. The origin is that Eurostat is publishing twice a day an update to EU ODP.
In the current proposal this precision is explicitely be lost. Can it DCAT-AP be relaxed to be using xsd:DateTime union xsd:Date?
In this case precision is kept if present, on the other hand it is not mandatory so that no artificial date is inserted.
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Consideration
I checked with the Government Linked Data WG and got the reply that the granularity of the "date" fields can be as precise as you want.
Proposed resolution
Use xsd:dateTime as a second allowable datatype for all date fields in the Application Profile
Proposed action
Update specification adding xsd:dateTime as valid datatype throughout section 7 alongside xsd:date.
Resolved at meeting 18 July 2013, see report at https://joinup.ec.europa.eu/document/dcat-application-profile-wg-virtual-meeting-2013-07-18.
Resolution implemented in draft 0.04 at https://joinup.ec.europa.eu/document/dcat-application-profile-data-portals-europe-draft-final-text.