SQL & PL/SQL

I am working on SQL Developer 1.5.1, i need to prepare hourly record of the activity on the database, for that i have a sql query that gives me the report as per selected columns on hourly basis.I need to prepare 24 reports a day.

Each time i have to go to the query , change the date as per hours like form 22:06:2011 10:00:00 to 22:06:2011 11:00:00 and get the report and export it in excel.

I want to automate the script so that whenever i run the script , it just asks me the date and runs the script 24 times and fetch me the hourly report of whole day.
the query syntax is something like this

Select
............................
...........................
..........................
from
..........................
........................
........................
where
And.......................
And...................
And......................

And req date between to-date( 22:06:2011 10:00:00) And to-date(22:06:2011 11:00:00)
Order by 7,1,2,3,4,5

Is there any possibility that i can automate the script to automatically change the hour itself and generate a report in excel 24 times?please share if you have any idea on this.

Looking forward for a response.