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 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-canonical-representation where > the timezone is always Z. > > The data I am working with is such that an exact date and time are not > always known. For example, a record in my database could contain a value > like 1918-00-00T00:00:00Z to indicate that the year is 1918 but the exact > month and day (let alone the time) are unknown. > > I searched the list archives and found a thread ( > http://marc.info/?l=solr-user&m=125438370510775&w=2 ) from a couple of > years ago that is basically the same situation as mine. I was just > wondering if there had been any updates since then that would allow > date/time segments with unknown values to be represented, or if I need to > do some kind of kludge to make this work. Thanks! > > Mari
