You should be able to type into a cell 05:18:33 and press enter and it should automatically show it correctly.
If not, click on a blank cell, then select Format, Cells and then select the number Tab.
Under Category click on Custom
Then under type, scrolldown until you find the following format hh:mm:ss and then click on OK
When back in the cell you selected, type 05:18:33 and press enter
If not, click on a blank cell, then select Format, Cells and then select the number Tab.
Under Category click on Custom
Then under type, scrolldown until you find the following format hh:mm:ss and then click on OK
When back in the cell you selected, type 05:18:33 and press enter