In the thick client based report writer, you can setup filters based on day, and time of day. There is an excellent post here detailing the steps. However this functionality is missing in the web based report writer, requiring us to grant access to the server for end users to be able to write such reports, submit requests to us to handle, or write custom SQL (such as here). It would be great to re-introduce the option to filter by "Time of Day" or "Day of Week" instead of just "Timestamp".