I'm not sure i understand what you're looking for but if you write about
unknown values i think of lack of precission. Solr allows you to reduce
precission of dates using the flexible DateMathParser.
http://lucene.apache.org/solr/api/org/apache/solr/util/DateMathParser.html
> Hello,
>
> I am
Hello,
I am just getting started with Solr and have a question about date/time
indexing. I know from the javadoc documentation (
http://lucene.apache.org/solr/api/org/apache/solr/schema/DateField.html ) that
the format should be a restricted form of
http://www.w3.org/TR/xmlschema-2/#dateTime-