Yes it has drilldown functionality.
Can't answer #2 as I do not know your report design.
Drilldown only lets you drill into data that is grouped. So you are asking to drill down on a date so if you group by date then you can drill down on that to see names listed as associated to that date. It all depends on how you group and set up your design.
You can mimic this process using a sub report that can show you wider range of data but it is not really drilling down.
You can also use parameters to limit the data which sounds a little more like what you were describing.
Edited by DBlank - 11 Nov 2009 at 10:20am