DatDiff for bonds

I do need to calculate interest rates on bonds. Though, in financial markets, a month has only 30 days and a year only 360 days. How to get the datdiff between the last payment date, say october 5 and today, dec. 2 with a month only having 30 days. The result has to be 57 days.
thanks
ColumAAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

RobertEnglishCommented:
How does this seem ?

Date1 = d1/m1/y1
Date2 = d2/m2/y2

' days in first unfinished month
part1 = DateDiff("d", Date1, 30/m1/y1)

' days in whole months
If m1 = m2 then
    part2 = 0
    part3 = 0
Else
    part2 = (DateDiff("d", 01/(m1+1)/y1, 01/m2/y2) -1) * 30

    ' days in last unfinished month
    If d2 = 31 then
        part3 = 30
    Else
        part3 = DateDiff("d", 01/m2/y2, Date2) + 1
    End If

End If

Result = part1 + part2 + part3
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Access

From novice to tech pro — start learning today.