Drupal module Date 2.7 update - Database Table name
It doesn't matter what tables are being updated, you can just go to /update.php of your site (you need to be logged in first) to apply these updates. You don't do them manually.

To find what was updated, you can look in the CHANGELOG.txt if the module has one, or, look in the install file for the module being updated within Date. It should have an applicable update hook that will show you (in code) what is being changed.

This is a list of everything that was changed in the last release.