query where first column only displays the first time it changes

I am trying to run a query that has a basic format like this.

Date           Time       Section                       Descritpion

July, 25th   8:00                                           Registration

July 25th    9:00         Section 1                   How to run a PL/SQL query

July 26th    8:00                                           Coffee and rolls

Now i want it to look like this

Date           Time       Section                       Descritpion

July, 25th   8:00                                           Registration

                   9:00       Section 1                   How to run a PL/SQL query

July 26th    8:00                                           Coffee and rolls

Is there an easy way to do this using group by or some other idea?  Thanks for your help.