Upgraded to Rails 2.1. This can have wide ranging consequences, so please help track down any issues introduced by the upgrade. Requires environment.rb modifications.

Changes you will need to make:

 * In your environment.rb, you will need to update references to a few files per environment.rb.tmpl
 * In your environment.rb, you will need to specify the local time zone of the computer that is running your Tracks install.

Other notes on my changes:

 * Modified our code to take advantage of Rails 2.1's slick time zone support.
 * Upgraded will_paginate for compatibility
 * Hacked the Selenium on Rails plugin, which has not been updated in some time and does not support Rails 2.1
 * Verified that all tests pass on my machine, including Selenium tests -- I'd like confirmation from others, too.

app/controllers/application.rb

@@ -2,7 +2,7 @@
 # Likewise will all the methods added be available for all controllers.
 
 require_dependency "login_system"
-require_dependency "source_view"
+require_dependency "tracks/source_view"
 require "redcloth"
 
 require 'date'
@@ -20,6 +20,7 @@ class ApplicationController < ActionController::Base
   layout proc{ |controller| controller.mobile? ? "mobile" : "standard" }
   
   before_filter :set_session_expiration
+  before_filter :set_time_zone
   prepend_before_filter :login_required
   prepend_before_filter :enable_mobile_content_negotiation
   after_filter :restore_content_type_for_mobile
@@ -178,6 +179,14 @@ class ApplicationController < ActionController::Base
     raise ArgumentError.new("invalid value for Boolean: \"#{s}\"")
   end
   
+  def self.openid_enabled?
+    Tracks::Config.openid_enabled?
+  end
+  
+  def openid_enabled?
+    self.class.openid_enabled?
+  end
+  
   private
         
   def parse_date_per_user_prefs( s )
@@ -213,4 +222,8 @@ class ApplicationController < ActionController::Base
     logger.error("ERROR: #{message}") if type == :error
   end
   
+  def set_time_zone
+    Time.zone = current_user.prefs.time_zone if logged_in?
+  end
+  
 end

app/controllers/login_controller.rb

@@ -6,11 +6,11 @@ class LoginController < ApplicationController
   skip_before_filter :login_required
   before_filter :login_optional
   before_filter :get_current_user
-  open_id_consumer if Tracks::Config.openid_enabled?
+  open_id_consumer if openid_enabled?
   
   def login
     @page_title = "TRACKS::Login"
-    @openid_url = cookies[:openid_url] if Tracks::Config.openid_enabled?
+    @openid_url = cookies[:openid_url] if openid_enabled?
     case request.method
       when :post
         if @user = User.authenticate(params['user_login'], params['user_password'])

app/controllers/stats_controller.rb

@@ -415,7 +415,7 @@ class StatsController < ApplicationController
     @max=0
     @actions_creation_hour_array = Array.new(24) { |i| 0}
     @actions_creation_hour.each do |r|
-      hour = current_user.prefs.tz.adjust(r.created_at).hour
+      hour = r.created_at.hour
       @actions_creation_hour_array[hour] += 1
     end
     0.upto(23) { |i| @max = @actions_creation_hour_array[i] if @actions_creation_hour_array[i] >  @max}
@@ -423,7 +423,7 @@ class StatsController < ApplicationController
     # convert to hash to be able to fill in non-existing days
     @actions_completion_hour_array = Array.new(24) { |i| 0}
     @actions_completion_hour.each do |r|              
-      hour = current_user.prefs.tz.adjust(r.completed_at).hour
+      hour = r.completed_at.hour
       @actions_completion_hour_array[hour] += 1
     end
     0.upto(23) { |i| @max = @actions_completion_hour_array[i] if @actions_completion_hour_array[i] >  @max}
@@ -446,7 +446,7 @@ class StatsController < ApplicationController
     @max=0
     @actions_creation_hour_array = Array.new(24) { |i| 0}
     @actions_creation_hour.each do |r|
-      hour = current_user.prefs.tz.adjust(r.created_at).hour
+      hour = r.created_at.hour
       @actions_creation_hour_array[hour] += 1
     end
     0.upto(23) { |i| @max = @actions_creation_hour_array[i] if @actions_creation_hour_array[i] >  @max}
@@ -454,7 +454,7 @@ class StatsController < ApplicationController
     # convert to hash to be able to fill in non-existing days
     @actions_completion_hour_array = Array.new(24) { |i| 0}
     @actions_completion_hour.each do |r|              
-      hour = current_user.prefs.tz.adjust(r.completed_at).hour
+      hour = r.completed_at.hour
       @actions_completion_hour_array[hour] += 1
     end
     0.upto(23) { |i| @max = @actions_completion_hour_array[i] if @actions_completion_hour_array[i] >  @max}

app/controllers/todos_controller.rb

@@ -267,9 +267,9 @@ class TodosController < ApplicationController
   def completed
     @page_title = "TRACKS::Completed tasks"
     @done = current_user.completed_todos
-    @done_today = @done.completed_within current_user.time - 1.day
-    @done_this_week = @done.completed_within current_user.time - 1.week
-    @done_this_month = @done.completed_within current_user.time - 4.week
+    @done_today = @done.completed_within Time.zone.now - 1.day
+    @done_this_week = @done.completed_within Time.zone.now - 1.week
+    @done_this_month = @done.completed_within Time.zone.now - 4.week
     @count = @done_today.size + @done_this_week.size + @done_this_month.size
   end
 
@@ -277,7 +277,7 @@ class TodosController < ApplicationController
     @page_title = "TRACKS::Archived completed tasks"
     @done = current_user.completed_todos
     @count = @done.size
-    @done_archive = @done.completed_more_than current_user.time - 28.days
+    @done_archive = @done.completed_more_than Time.zone.now - 28.days
   end
   
   def list_deferred
@@ -392,7 +392,7 @@ class TodosController < ApplicationController
 
     if params.key?('due')
       due_within = params['due'].to_i
-      due_within_when = current_user.time + due_within.days
+      due_within_when = Time.zone.now + due_within.days
       condition_builder.add('todos.due <= ?', due_within_when)
       due_within_date_s = due_within_when.strftime("%Y-%m-%d")
       @title << " due today" if (due_within == 0)
@@ -402,7 +402,7 @@ class TodosController < ApplicationController
 
     if params.key?('done')
       done_in_last = params['done'].to_i
-      condition_builder.add('todos.completed_at >= ?', current_user.time - done_in_last.days)
+      condition_builder.add('todos.completed_at >= ?', Time.zone.now - done_in_last.days)
       @title << " actions completed"
       @description << " in the last #{done_in_last.to_s} days"
     end

app/controllers/users_controller.rb

@@ -1,6 +1,6 @@
 class UsersController < ApplicationController
 
-  if Tracks::Config.openid_enabled?
+  if openid_enabled?
      open_id_consumer
      before_filter  :begin_open_id_auth,    :only => :update_auth_type
   end
@@ -153,7 +153,7 @@ class UsersController < ApplicationController
   end
   
   def update_auth_type
-    if (params[:user][:auth_type] == 'open_id') && Tracks::Config.openid_enabled?
+    if (params[:user][:auth_type] == 'open_id') && openid_enabled?
       case open_id_response.status
         when OpenID::SUCCESS
           # The URL was a valid identity URL. Now we just need to send a redirect
@@ -179,7 +179,7 @@ class UsersController < ApplicationController
   end
   
   def complete
-    return unless Tracks::Config.openid_enabled?
+    return unless openid_enabled?
     openid_url = session['openid_url']
     if openid_url.blank?
       notify :error, "expected an openid_url"

app/helpers/application_helper.rb

@@ -3,7 +3,7 @@
 module ApplicationHelper
   
   def user_time
-    current_user.time
+    Time.zone.now
   end
   
   # Replicates the link_to method but also checks request.request_uri to find

app/models/preference.rb

@@ -1,8 +1,5 @@
 class Preference < ActiveRecord::Base
   belongs_to :user
-  composed_of :tz,
-              :class_name => 'TimeZone',
-              :mapping => %w(time_zone name)
     
   def self.due_styles
     { :due_in_n_days => 0, :due_on => 1}

app/models/project.rb

@@ -1,7 +1,7 @@
 class Project < ActiveRecord::Base
   has_many :todos, :dependent => :delete_all, :include => :context
   has_many :notes, :dependent => :delete_all, :order => "created_at DESC"
-  belongs_to :default_context, :dependent => :nullify, :class_name => "Context", :foreign_key => "default_context_id"
+  belongs_to :default_context, :class_name => "Context", :foreign_key => "default_context_id"
   belongs_to :user
   
   validates_presence_of :name, :message => "project must have a name"

app/models/todo.rb

@@ -1,6 +1,6 @@
 class Todo < ActiveRecord::Base
 
-  belongs_to :context, :order => 'name'
+  belongs_to :context
   belongs_to :project
   belongs_to :user
   

app/models/user.rb

@@ -158,7 +158,7 @@ class User < ActiveRecord::Base
   end
   
   def time
-    prefs.tz.adjust(Time.now.utc)
+    Time.now.in_time_zone(prefs.time_zone)
   end
 
   def date

app/views/preferences/index.html.erb

@@ -7,7 +7,7 @@
     <li>Last name: <span class="highlight"><%= current_user.last_name %></span></li>
     <li>Date format: <span class="highlight"><%= prefs.date_format %></span> Your current date: <%= format_date(user_time) %></li>
     <li>Title date format: <span class="highlight"><%= prefs.title_date_format %></span> Your current title date: <%= user_time.strftime(prefs.title_date_format) %></li>
-    <li>Time zone: <span class="highlight"><%= prefs.tz %></span> Your current time: <%= user_time.strftime('%I:%M %p') %></li>
+    <li>Time zone: <span class="highlight"><%= prefs.time_zone %></span> Your current time: <%= user_time.strftime('%I:%M %p') %></li>
     <li>Week starts on: <span class="highlight"><%= Preference.day_number_to_name_map[prefs.week_starts] %></span></li>
     <li>Show the last <span class="highlight"><%= prefs.show_number_completed %></span> completed items</li>
     <li>Show completed projects in sidebar: <span class="highlight"><%= prefs.show_completed_projects_in_sidebar %></span></li>