diff --git a/book/_config.yml b/book/_config.yml
index 014f2e0..6040201 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -43,7 +43,7 @@ sphinx:                                              # Options passed on to the
         thebe: true                                  # Required for live code, part of TeachBooks-Sphinx-Thebe (https://teachbooks.io/manual/features/live_code.html)
       announcement: ""                               # Default value (line can be removed), sets a banner announcement at the top of the site, configuration part of Jupyterbook v1 (https://jupyterbook.org/en/stable/customize/config.html)
     html_show_copyright:   false                     # As the copyright is included in the author field, configuration part of Sphinx (https://www.sphinx-doc.org/en/master/index.html)
-    html_last_updated_fmt: '%B %-d, %Y'              # Adds the date of the last update to the footer, use '%-d %B %Y' for a Dutch formatting of the date, configuration part of Sphinx (https://www.sphinx-doc.org/en/master/index.html)
+    html_last_updated_fmt: ''                        # Adds the date of the last update to the footer, if '' based on value of language
     html_static_path: ["figures"]                    # Add folder that contain files that need to be included, such as the location of the logo(s), configuration part of Sphinx (https://www.sphinx-doc.org/en/master/index.html)
     mathjax3_config:
       chtml: {
@@ -118,6 +118,12 @@ sphinx:                                              # Options passed on to the
         default_copyright: authoryear                # Default value (line can be removed), sets default copyright to author and year, configuration part of Sphinx Metadata Figure (https://teachbooks.io/manual/_git/github.com_TeachBooks_Sphinx-Metadata-Figure/main/MANUAL.html)
       source:
         warn_missing: false                          # Default value (line can be removed), doesn't raise a warning for missing sources, configuration part of Sphinx Metadata Figure (https://teachbooks.io/manual/_git/github.com_TeachBooks_Sphinx-Metadata-Figure/main/MANUAL.html)
+    git_untracked_check_dependencies: true           # Default value (line can be removed), allow checking dependencies for last updated date of untracked files, configuration part of Sphinx-Last-Updated-by-Git (https://github.com/mgeier/sphinx-last-updated-by-git/)
+    git_untracked_show_sourcelink: false             # Default value (line can be removed), doesn't show source link for untracked files, configuration part of Sphinx-Last-Updated-by-Git (https://github.com/mgeier/sphinx-last-updated-by-git/)
+    git_last_updated_timezone: 'Europe/Amsterdam'    # Sets local timezone for last updated date, otherwise uses local time zone of build, configuration part of Sphinx-Last-Updated-by-Git (https://github.com/mgeier/sphinx-last-updated-by-git/)
+    git_last_updated_metatags: true                  # Default value (line can be removed), adds meta tags with git last updated information to the HTML head, configuration part of Sphinx-Last-Updated-by-Git (https://github.com/mgeier/sphinx-last-updated-by-git/)
+    git_exclude_patterns: []                         # Default value (line can be removed), sets a list of patterns to *skip* in git last updated date checking, configuration part of Sphinx-Last-Updated-by-Git (https://github.com/mgeier/sphinx-last-updated-by-git/)
+    git_exclude_commits: []                          # Default value (line can be removed), sets a list of commit hashes to *skip* in git last updated date checking, configuration part of Sphinx-Last-Updated-by-Git (https://github.com/mgeier/sphinx-last-updated-by-git/)
     sphinx_github_alerts_backquotes: 3               # Default value (line can be removed), sets the number of backticks used to start and end the admonitions, configuration part of Sphinx-GitHub-Alerts (https://teachbooks.io/manual/_git/github.com_TeachBooks_Sphinx-GitHub-Alerts/main/README.html)
     sphinx_github_alerts_redirects: {}               # Default value (line can be removed), no redirects are set, configuration part of Sphinx-GitHub-Alerts (https://teachbooks.io/manual/_git/github.com_TeachBooks_Sphinx-GitHub-Alerts/main/README.html)