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Format numbers as currency - Microsoft Support
If you want to display numbers as monetary values, you must format those numbers as currency. To do this, you apply either the Currency or Accounting number format to the cells that you want to format. The number formatting options are available on the Home tab, in the Number group.
Calculate the difference between two times - Microsoft Support
There are two approaches that you can take to present the results in the standard time format (hours : minutes : seconds). You use the subtraction operator (-) to find the difference between times, and then do either of the following: Apply a custom format code to the cell by doing the following: Select the cell.