Can an Access MACRO be used in an Excel spreadsheet?

I am trying to do a custom mm/dd/yyyy h:mm field minus another custom field
(same) to get how many days, hours and minutes have passed. Or even to just
convert the results to total hours (to the nearest hour) that have passed. I
am not as savvy in Excel as I have been in Access. When I import my excel
spread sheet into Access the field goes to TEXT and I can't get it back to
the original format without loosing the data. Would this be a better
question for the Access folks? I am loosing time and need this report done
soon. Thanks for any guidance you can give me.
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Thanks!
Lonnie Jo