diff --git a/debian/patches/reproducibility b/debian/patches/reproducibility
index 6def319..ddcee1f 100644
--- a/debian/patches/reproducibility
+++ b/debian/patches/reproducibility
@@ -10,7 +10,7 @@ Bug-Debian: https://bugs.debian.org/807201
        comment "http://github.com/rtomayko/ronn/tree/#{Ronn.revision}"
        return if name.nil?
 -      macro "TH", %["#{escape(name.upcase)}" "#{section}" "#{date.strftime('%B %Y')}" "#{version}" "#{manual}"]
-+      macro "TH", %["#{escape(name.upcase)}" "#{section}" "#{date.strftime('%Y-%m-%d')}" "#{version}" "#{manual}"]
++      macro "TH", %["#{escape(name.upcase)}" "#{section}" "#{date.utc.strftime('%Y-%m-%d')}" "#{version}" "#{manual}"]
      end
  
      def remove_extraneous_elements!(doc)
@@ -21,10 +21,19 @@ Bug-Debian: https://bugs.debian.org/807201
  
      def date
 -      @document.date.strftime('%B %Y')
-+      @document.date.strftime('%Y-%m-%d')
++      @document.date.utc.strftime('%Y-%m-%d')
      end
  
      def wrap_class_name
+--- a/lib/ronn/document.rb
++++ b/lib/ronn/document.rb
+@@ -166,6 +166,7 @@
+     def date
+       return @date if @date
+       return File.mtime(path) if File.exist?(path)
++      return Time.at(ENV['SOURCE_DATE_EPOCH'].to_i).gmtime if not ENV['SOURCE_DATE_EPOCH'].nil?
+       Time.now
+     end
 --- a/test/test_ronn.rb
 +++ b/test/test_ronn.rb
 @@ -23,7 +23,7 @@