1. Select the cell where you want to insert the current date.
2. Press the "Ctrl" and ";" keys on your keyboard at the same time. This will insert the current date in the selected cell.
3. To insert the current time in a different column, select the cell where you want to insert the time.
4. Press the "Ctrl" and ":" keys on your keyboard at the same time. This will insert the current time in the selected cell.

Alternatively, you can use the following formulas to automatically fill in the current date and time:

1. For the current date, enter the formula in the cell where you want to insert the date. This will automatically update the date every time you open the spreadsheet.
2. For the current time, enter the formula in the cell where you want to insert the time. This will automatically update the time every time you open the spreadsheet.

You can also format the cells to display the date and time in a specific format. To do this, right-click on the cell and select "Format Cells". In the "Number" tab, select "Date" or "Time" and choose the desired format from the list.