GOMDateConstruct is a base interface for several concrete DateConstruct
implementations like {@link org.apache.lucene.gdata.gom.GOMUpdated} or
{@link org.apache.lucene.gdata.gom.GOMPublished}
A Date construct is an element whose content MUST conform to the "date-time"
production in [RFC3339]. In addition, an uppercase "T" character MUST be used
to separate date and time, and an uppercase "Z" character MUST be present in
the absence of a numeric time zone offset.
atomDateConstruct = atomCommonAttributes, xsd:dateTime
Such date values happen to be compatible with the following specifications:
[ISO.8601.1988], [W3C.NOTE-datetime-19980827], and
[W3C.REC-xmlschema-2-20041028].
Example Date constructs:
<updated>2003-12-13T18:30:02Z</updated>
<updated>2003-12-13T18:30:02.25Z</updated>
<updated>2003-12-13T18:30:02+01:00</updated>
<updated>2003-12-13T18:30:02.25+01:00</updated>
Date values SHOULD be as accurate as possible. For example, it would be
generally inappropriate for a publishing system to apply the same timestamp
to several entries that were published during the course of a single day.
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