Research where in the admin interface you can export configuration.
In Drupal 7 most configuration was stored in the variables table of the database. In Drupal 8 most configuration is found in yaml files that you can import and export from a site.
Navigate to: admin/config/development/configuration
See the three local tabs Synchronize, Import, and Export.
If you go to the Export tab, you can choose to export a single item or the entire site configuration.
Here is an example of a single export of this site's system date configuration.
A side by side comparison of the system date form located at /admin/config/regional/settings and the single import of system date will show the same information.