# days365

Days between dates based on 365-day year

## Syntax

``NumDays = days365(StartDate,EndDate)``

## Description

example

````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

collapse all

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

collapse all

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`

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

collapse all

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`.

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