| excel_date_cells | Find the cells a workbook formats as dates |
| excel_date_columns | Summarise date-formatted cells by column |
| excel_date_system | Read the date system a workbook declares |
| excel_origin | The origin date behind each Excel date system |
| excel_sheets | List the sheets in a workbook |
| fix_serial_columns | Revert Excel date serials across a data frame |
| restore_day_month | Revert Excel date serials in an already-imported vector |
| serial_to_day_month | Convert Excel date serials to 'day.month' values |
| unexcel_xlsx | Read an '.xlsx' sheet and undo its date auto-conversion |