Return the number of days in the year y with an optional basis
b.
Valid bases
- 0
actual/actual (default)
- 1
30/360 (SIA)
- 2
actual/360
- 3
actual/365
- 4
30/360 (PSA)
- 5
30/360 (IDSA)
- 6
30/360 (European)
- 7
actual/365 (Japanese)
- 8
actual/actual (ISMA)
- 9
actual/360 (ISMA)
- 10
actual/365 (ISMA)
- 11
30/360E (ISMA)
See also: days365, days360, daysact, daysdif.