It doesn’t matter if you are using Google Sheets or Microsoft Excel; you can use these hotkeys. To add the date, select a cell and press these buttons – Ctrl+; To add the current time ...

Before you add any calculations or checkboxes, you need to tell Excel that certain columns ... Alternatively, to display the time and date together, click "Custom" in the Format Cells dialog ...

In case you do not want to use the predefined date or time format, you can change them in Google Sheet and Excel Online. For your information, you do not need to use an add-on or any other third ...