Fumiki Takahashi

TAROSKY INC.

You can enter expiration date on edit screen. 
This plugin runs cron every minute to search expired posts and make them <code>private</code>.

Taro Clockwork Post

A WordPress plugin to expire post with specified date.

Travis Lopes

ForGravity

<blockquote>
<h4><a href="https://cosmicgiant.com/plugins/entry-automation/?utm_source=wordpress&utm_medium=readme&utm_campaign=readme" rel="nofollow ugc">Entry Automation for Gravity Forms</a> makes entry deletion more powerful and allows you to export your entries too!</h4>
Entry Expiration started out as a simple tool to automatically remove your old form entries. But what if you need more control over when entries are deleted? Want to apply conditional logic to target specific entries? Or maybe delete specific field values rather than the whole entry? Need to generate an export file before getting rid of those entries?
<a href="https://cosmicgiant.com/plugins/entry-automation/?utm_source=wordpress&utm_medium=readme&utm_campaign=readme" rel="nofollow ugc">Check out Entry Automation</a> today!
</blockquote>
When integrating Gravity Forms with a third-party service, it’s often not necessary to keep entries around after a short period of time as you already have the data imported elsewhere.
Entry Expiration for Gravity Forms allows you to automatically delete Gravity Forms entries older than a defined timeframe. After activating the plugin, set the oldest age for an entry on the Entry Expiration Settings page. At midnight, the plugin will delete all entries on enabled forms that are older than the time you set.

Entry Expiration for Gravity Forms

This is a great solution to automatically delete form entries after a specific amount of time like a month.

This was instrumental for our GDPR compliance of our contact form.

Great Plugin for GDPR compliance

Automatically remove old form entries on a custom, defined schedule

Taro Clockwork Post vs Entry Expiration for Gravity Forms