As Miles said, use the DateTools (lucene) class with a DAY resolution. That'll give you a YYYYMMDD format, which won't blow your query with a "TooManyClauses" exception.......
Remember that Lucene deals with strings, so you want to store things in easily-manipulated string format, often one that's suitable for comparison. Which is what you want to do when you create a RangeQuery Erick
