I thought I would share my take on tracking time in smartsheet. Use the checkbox and save features to test the formulas out and see how they work.
https://app.smartsheet.com/b/publish?EQBCT=77c33874736d40a78495cf4d4169365f
Of course this would be useless were the current time and not just date to be able to be used, but that would require a lot of power from the program, so I don't believe something like that will be implemented anytime soon.