You cannot turn off a campaign automatically at midnight, but you can disable a form within a campaign at midnight so it is no longer available to accept donations/registrations.

You will accomplish this at the form level through these steps:

From the home dashboard, select "Form List".

After navigating to your form list, click on the name of the campaign that will need to be turned off at midnight.

While on the campaign dashboard, click on "Form Details".

Scroll down to "Form Availability" and click on "Edit" to change the times.

You can do this through the calendar button:

Note: You'll need to select a day on the calendar before you can select a time!

OR You can type it in:

You also have the ability to include a custom closed message if you wish: