I'm still working to get the hang of Lucene and am not sure how to
structure this query.

I'm trying to delete all items older than a certain date.  It seems I have
to do a range query, yes?  What format do I use for the dates?

            _Session.Advanced.DatabaseCommands.DeleteByIndex(
                typeof(AssetsByExpirationDate).Name,
                new IndexQuery()
                {
                    Query =
string.Format("ExpirationDate:[\"{0:MM/dd/yyyy}\" TO \"{1:MM/dd/yyyy}\"]",
DateTime.MinValue, new DateTime(2012,6,1))
                });

Any guidance on this topic would be appreciated.