Min DateTime for Each Day

Min DateTime for Each Day

I have a security access log and I want to find the earliest time entry for each day. I have one DateTime field.

DateTime                  Access
2014/05/14 08:23      Door #1 Opened
2014/05/14 08:56      Door #1 Opened
2014/05/14 12:15      Door #1 Opened
2014/05/14 18:23      Door #1 Opened
2014/05/15 08:59      Door #1 Opened
2014/05/15 08:56      Door #1 Opened
2014/05/15 12:15      Door #1 Opened
2014/05/15 18:23      Door #1 Opened

All I want is the first record for each day. Is this possible? Thanks!!