diff -ruN redmine-1.1.2/app/helpers/application_helper.rb redmine/app/helpers/application_helper.rb
--- redmine-1.1.2/app/helpers/application_helper.rb	2011-03-07 23:14:36.000000000 +0330
+++ redmine/app/helpers/application_helper.rb	2011-03-15 21:34:03.251201991 +0330
@@ -837,10 +837,12 @@
           'Calendar._FD = 1;' # Monday
         when 7
           'Calendar._FD = 0;' # Sunday
+        when 6
+          'Calendar._FD = 6;' # Saturday
         else
           '' # use language
         end
         
         javascript_include_tag('calendar/calendar') +
         javascript_include_tag("calendar/lang/calendar-#{current_language.to_s.downcase}.js") +
         javascript_tag(start_of_week) +  
diff -ruN redmine-1.1.2/app/views/settings/_display.rhtml redmine/app/views/settings/_display.rhtml
--- redmine-1.1.2/app/views/settings/_display.rhtml	2011-03-07 23:14:37.000000000 +0330
+++ redmine/app/views/settings/_display.rhtml	2011-03-15 21:38:45.421201966 +0330
@@ -5,7 +5,7 @@
 
 <p><%= setting_select :default_language, lang_options_for_select(false) %></p>
 
-<p><%= setting_select :start_of_week, [[day_name(1),'1'], [day_name(7),'7']], :blank => :label_language_based %></p>
+<p><%= setting_select :start_of_week, [[day_name(1),'1'], [day_name(7),'7'], [day_name(6),'6']], :blank => :label_language_based %></p>
 
 <p><%= setting_select :date_format, Setting::DATE_FORMATS.collect {|f| [Date.today.strftime(f), f]}, :blank => :label_language_based %></p>