Simple Apps Script that allows you to auto-close a Google Form without the need for a 3rd party add-on.

All you have to do is:

1. add a script to your current form
2. copy/paste the code from my project
3. edit FORM_ID (line 22)
4. edit FORM_CLOSE_DATE (line 25)
5. Save and run the "Initialize" function
   1. This auto-creates a trigger to run the script for you on the date/time you entered

Why would you use this script and not an add-on?

1. you can see what it actually does
2. it isn't written by an unknown 3rd party :)