---
schema_version: "1"
id: 6f58934acc0190d1f8c4b054bdcc74dcc98f0a20b71e3a14e4cf3cdfeae4a99a
title: isPeriodType
collection: mulesoft
version: current
locale: en-us
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content_type: documentation
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release: "2.4"
latest: false
---
---
product: DataWeave
version: 2.4
---

# isPeriodType

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

## isPeriodType(t: Type): Boolean

Returns `true` if the input is the Period type.

_Introduced in DataWeave version 2.3.0._

### Parameters

<table><colgroup><col> <col></colgroup><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><p><code>t</code></p></td><td><p>The type to check.</p></td></tr></tbody></table>

### Example

This example shows how `isPeriodType` behaves with different inputs.

#### Source

```DataWeave
%dw 2.0
import * from dw::core::Types
type APeriod = Period
output application/json
---
{
   a: isPeriodType(APeriod),
   b: isPeriodType(Period),
   c: isPeriodType(String),
}
```

#### Output

```Json
{
  "a": true,
  "b": true,
  "c": false
}
```