For many of the financial functions, the day count basis is used:
| Basis Number |
Day Count Basis |
| 0 (or omitted) |
United States of America (NASD) 30/360 |
| 1 |
Actual/Actual |
| 2 |
Actual/360 |
| 3 |
Actual/365 |
| 4 |
European 30/360 |
[NASD is the National Association of Securities Dealers.]