---
schema_version: "1"
id: 564cff8cbb847fce29a5af005a4f50526fd3ecaeb98ef70139e5aebc5290b613
title: isPeriodType
collection: mulesoft
version: current
locale: en-us
portal_url: https://docs.salesforce.com/mulesoft/current/en-us/dataweave/2.9/dw-types-functions-isperiodtype.md
canonical_url: https://docs.mulesoft.com/dataweave/2.9/dw-types-functions-isperiodtype
source_site: docs.mulesoft.com
content_type: documentation
content_hash: 47b1589f20499f52fcf1b995e7a3042a175d62f15b802b871c8b338076469101
description: MuleSoft Documentation Site
release: "2.9"
latest: false
---
---
product: DataWeave
version: 2.9
---

# 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
}
```