The coupons were presented to the bond issuer by the bondholder to collect periodic interest payments.
The Excel COUPDAYSNC function returns the number of days from the settlement date to the next coupon date.
Thesettlement date is the date the investor takes possession of a security.
Thefrequencyis the number of interest payments per year.Basisspecifies the method used to count days (see below).
Entering dates
In Excel,dates are serial numbers.
To enter valid dates directly, you’re able to use theDATE function.
Basis
Thebasisargument controls how days are counted.
The COUPDAYSNC function allows 5 options (0-4) and defaults to zero, which specifies US 30/360basis.
Thisarticle on wikipediaprovides a detailed explanation of available conventions.