DDAYS and "financial" year

[salvomic]

hi,
DDAYS is really useful (like also DATEADD and DAYOFWEEK)!
In a next update of FW it would be nice to add an option to handle "financial" (or "commercial") year (months of 30 days, 360 days of years), useful for calculation of simple interest (like HP 12C do).

Formulas are in the User Guide of 12C (Appendix E, page 250). 12C can handles dates both as m.ddyyyy, d.mmyyyy, so those formulas are intended for theese formats...

Salvo