Unfortunately I don't believe this is currently possible.
You can only filter by time frames, and not a subset of those time frames.
For example, you won't be able to pull a weekly report, and then have it separate those leads created into which day of the week. Similarly, you won't be able pull up a daily report, and then have it separate those leads created into which hour of the day.
The workaround would be to create a report for each specific date.
There's an idea up right now in reference to something similar to this:
http://community.marketo.com/MarketoIdeaDetail?id=08750000000INIEAA4