Supposing we have the following records in an SQL Server table.
Date 19/5/2009 12:00:00 pm 19/5/2009 12:15:22 pm 20/5/2009 11:38:00 am
What
Depends on your DBMS. Example for Mysql:
SELECT DATE_FORMAT(dateColumn, '%e/%c/%Y') as `date`, COUNT(*) FROM YourTable GROUP BY `date`