Closes academicpages#828 with update to put the pages last update in the footer.

Author: rjzupkoii

Gemfile

@@ -3,6 +3,7 @@ source 'https://rubygems.org'
 group :jekyll_plugins do
   gem 'jekyll'
   gem 'jekyll-feed'
+  gem 'jekyll-last-modified-at'
   gem 'jekyll-sitemap'
   gem 'jemoji'
   gem 'webrick', '~> 1.8'

_config.yml

@@ -169,10 +169,12 @@ exclude:
   - CHANGELOG
   - Capfile
   - config
+  - Dockerfile
   - Gemfile
   - Gruntfile.js
   - gulpfile.js
   - LICENSE
+  - local
   - log
   - node_modules
   - package.json*
@@ -290,16 +292,17 @@ sass:
 permalink: /:categories/:title/
 # paginate: 5 # amount of posts to show
 # paginate_path: /page:num/
-timezone: America/Los_Angeles # http://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+timezone: Etc/UTC # http://en.wikipedia.org/wiki/List_of_tz_database_time_zones
 
 
 # Plugins
 plugins:
-  - jekyll-paginate
-  - jekyll-sitemap
-  - jekyll-gist
   - jekyll-feed
+  - jekyll-gist
+  - jekyll-last-modified-at  
+  - jekyll-paginate
   - jekyll-redirect-from
+  - jekyll-sitemap
   - jemoji
 
 # Mimic GitHub Pages with --safe

_includes/footer.html

@@ -19,4 +19,7 @@
 </div>
 {% endif %}
 
-<div class="page__footer-copyright">&copy; {{ site.time | date: '%Y' }} {{ site.name | default: site.title }}. {{ site.data.ui-text[site.locale].powered_by | default: "Powered by" }} <a href="http://jekyllrb.com" rel="nofollow">Jekyll</a> &amp; <a href="https://github.com/academicpages/academicpages.github.io">AcademicPages</a>, a fork of <a href="https://mademistakes.com/work/minimal-mistakes-jekyll-theme/" rel="nofollow">Minimal Mistakes</a>.</div>
+<div class="page__footer-copyright">
+  &copy; {{ site.time | date: '%Y' }} {{ site.name | default: site.title }}, {{ site.data.ui-text[site.locale].powered_by | default: "Powered by" }} <a href="http://jekyllrb.com" rel="nofollow">Jekyll</a> &amp; <a href="https://github.com/academicpages/academicpages.github.io">AcademicPages</a>, a fork of <a href="https://mademistakes.com/work/minimal-mistakes-jekyll-theme/" rel="nofollow">Minimal Mistakes</a>.<br />
+  This page last updated {{ page.last_modified_at | date: '%Y-%m-%d' }}
+</div>