description:
| Returns the number of days between two dates based on a 360-day year. |
syntax:
| =DAYS360( start_date, end_date, [method] ) |
required arguments:
| start_date | The start date. |
| end_date | The end date. |
optional arguments:
| [method] | The type of day count basis. TRUE is the European method, FALSE (default) is US method. |
