days365

Days between dates based on 365-day year

Syntax

NumDays = days365(StartDate,EndDate)

Description

NumDays = days365(StartDate,EndDate) returns the number of days between StartDate and EndDate based on a 365-day year. All months contain their actual number of days. February always contains 28 days.

If EndDate is earlier than StartDate, NumDays is negative. Under this convention, all months contain 30 days.

Either input argument can contain multiple values, but if so, the other must contain the same number of values or a single value that applies to all. For example, if StartDate is an n-row character array of date character vectors, then EndDate must be an N-by-1 vector of integers or a single integer. NumDays is then an N-by-1 vector of date numbers.

Examples

Determine the Number of Days Between Two Dates Based on a 365-Day Year

Determine the NumDays using date character vectors for StartDate and EndDate.

NumDays = days365('15-jan-2000', '15-mar-2000')

NumDays = 59

Determine the NumDays using a datetime array for StartDate.

NumDays = days365(datetime('15-jan-2000','Locale','en_US'), '15-mar-2000')

NumDays = 59

Determine the NumDays using a vector for EndDate.

MoreDays = ['15-mar-2000'; '15-apr-2000'; '15-jun-2000'];
NumDays = days365('15-jan-2000', MoreDays)

NumDays = 3×1

    59
    90
   151

Input Arguments

StartDate — Start date

serial date number | date character vector | datetime object

Start date, specified as a scalar or an N-by-1 or 1-by-N vector using serial date numbers, date character vectors, or datetime arrays.

Data Types: double | char | datetime

EndDate — End date

serial date number | date character vector | datetime object

End date, specified as a scalar or an N-by-1 or 1-by-N vector using serial date numbers, date character vectors, or datetime arrays.

Data Types: double | char | datetime

Output Arguments

NumDays — Number of days between two dates based on 365-day year

vector

Number of days between two dates based on a 365-day year, returned as a scalar or an N-by-1 or 1-by-N vector containing the number of days.

NumDays returns as a double for serial date number, date character vector, or datetime inputs for StartDate and EndDate.

References

[1] Addendum to Securities Industry Association, Standard Securities Calculation Methods: Fixed Income Securities Formulas for Analytic Measures. Vol. 2, Spring 1995.