> For the complete documentation index, see [llms.txt](https://docs.onum.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.onum.com/pipelines/actions/transformation/field-transformation/field-transformation-operations/list-manipulation/count-list-timestamp.md).

# Count list timestamp

## Description

This operation counts the number of elements in a given list of timestamps.

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## Data types

These are the input/output expected data types for this operation:

### Input data

`ListTimestamp` - The input lists of timestamps.

### Output data <a href="#output-data" id="output-data"></a>

`Integer` - Number of elements in the input lists.

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## Example

Suppose you want to **count the number of elements in your input list of timestamps**:

1. In your Pipeline, open the required [Action](/pipelines/actions.md) configuration and select the input **Field**.
2. In the **Operation** field, choose **Count list timestamp**.
3. Give your **Output field** a name and click **Save**. You'll get the number of elements in your input timestamp lists. For example:

```
Input data - 2024-05-17T14:30:00Z, 2022-10-19T14:30:04Z, 1998-04-10T14:49:00Z

Output data - 3
```

{% hint style="info" %}
You can try out operations with specific values using the **Input** field above the operation. You can enter the value in the example above and check the result in the **Output** field.
{% endhint %}