Time add of 24hrs+

Hi,

I have the attached spreadsheet.

All i'm trying to do is add time which is more than 24 hours to a date/time field and then give me a result.

i.e. D2+C2 should equal 15/05/2013 12:00:00 AM for example (I believe)

The formula works if the time is within 24 hours which you will see in row 3.

Any help would be great.

I'm in Australia so the date/time format of dd/mm/yyyy hh:mm:ss is perfect for me.

Cheers