Adding days hours and minutes to calculate time of end of auction?

To best describe or illustrate your problem you would be better off attaching a dummy workbook. The workbook should contain the same structure and some dummy data of the same type as the type you have in your real workbook - so, if a cell contains numbers & letters in this format abc-123 then that should be reflected in the dummy workbook.

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click that and select "add files" (top right corner).
click "select files" find your file, click "open" click "upload" click 'done" bottom right. click "submit reply"

Once the upload is completed the file name will appear below the input boxes in this window.
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In F1 write start date and time i.e. 12/1/2012 1:00pm

In F2

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Copy down

Enter 1:00pm as 1:00 pm with the space

Format all cells in Col F likewise
See attached