# Documentation

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# iscalendarduration

Determine if input is calendar duration array

## Syntax

``tf = iscalendarduration(t)``

## Description

example

````tf = iscalendarduration(t)` returns logical `1` (`true`) if `t` is a `calendarDuration` array. Otherwise, it returns logical `0` (`false`).```

## Examples

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Determine if the output of an arithmetic calculation is a `calendarDuration` array.

Add two `calendarDuration` arrays.

```d1 = calyears(1:4); d2 = caldays(1:4); d = d1 + d2```
```d = 1x4 calendarDuration array 1y 1d 2y 2d 3y 3d 4y 4d ```

Determine if the output is a `calendarDuration` array.

`tf = iscalendarduration(d)`
```tf = logical 1 ```

## Input Arguments

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Input array, specified as a scalar, vector, matrix, or multidimensional array. `t` can be any data type.