Date Format

I have a strange data format on the attached example. It is in euro in the data sheet (dd/mm/yy) and I want it to be US (mm/dd/yy). I tried changing the date to a number and using the =date function. That does not work. The number is strange. When I graph with the current date formatting I get the strange value on the X axis instead of the date displayed in the cell.

Can someone help me correctly format this data to mm/dd/yy hh:mm:ss?