diff --git a/.github/workflows/spec.yml b/.github/workflows/spec.yml
index 9a360e10d..8e1a82da1 100644
--- a/.github/workflows/spec.yml
+++ b/.github/workflows/spec.yml
@@ -70,13 +70,13 @@ jobs:
       #   with:
       #     project-token: ${{ secrets.CODACY_PROJECT_TOKEN }}
       #     coverage-reports: coverage/coverage.xml
-      - name: Upload Capybara Failure Screenshots
-        uses: actions/upload-artifact@v3
-        if: always()
-        with:
-          name: capybara-screenshots
-          path: tmp/capybara/
-          retention-days: 7
+      # - name: Upload Capybara Failure Screenshots
+      #   uses: actions/upload-artifact@v4
+      #   if: always()
+      #   with:
+      #     name: capybara-screenshots
+      #     path: tmp/capybara/
+      #     retention-days: 7
       # - name: Publish code coverage
       #   run: |
       #     export GIT_BRANCH="${GITHUB_REF/refs\/heads\//}"
diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index 492c98a7f..df07ae03f 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -150,7 +150,7 @@ def rescheduling_hint(affected_event_count)
   # ==== Returns
   # class hidden if conference is over
   def hidden_if_conference_over(conference)
-    'hidden' if Date.today > conference.end_date
+    'hidden' if Time.zone.today > conference.end_date
   end
 
   # TODO-SNAPCON: Replace this with a search for a conference logo.
diff --git a/app/models/cfp.rb b/app/models/cfp.rb
index 87cb70cd1..8cc1f7745 100644
--- a/app/models/cfp.rb
+++ b/app/models/cfp.rb
@@ -76,7 +76,7 @@ def end_week
     end_date.strftime('%W').to_i
   end
 
-  def remaining_days(date = Date.today)
+  def remaining_days(date = Time.zone.today)
     result = (end_date - date).to_i
     result > 0 ? result : 0
   end
diff --git a/app/models/conference.rb b/app/models/conference.rb
index 20e1ce441..204effbe8 100644
--- a/app/models/conference.rb
+++ b/app/models/conference.rb
@@ -391,7 +391,7 @@ def get_registration_end_week
   # * +false+ -> If the conference start date is in the past.
   # * +true+ -> If the conference start date is in the future.
   def pending?
-    start_date > Date.today
+    start_date > Time.zone.today
   end
 
   ##
@@ -686,7 +686,7 @@ def self.get_event_state_line_colors
   def self.write_event_distribution_to_db
     week = DateTime.now.end_of_week
 
-    Conference.where('end_date > ?', Date.today).find_each do |conference|
+    Conference.where('end_date > ?', Time.zone.today).find_each do |conference|
       result = {}
       Event.state_machine.states.each do |state|
         count = conference.program.events.where('state = ?', state.name).count
@@ -905,7 +905,7 @@ def get_events_per_week_by_state
     end
 
     # Actual week
-    this_week = Date.today.end_of_week.strftime('%W').to_i
+    this_week = Time.zone.today.end_of_week.strftime('%W').to_i
     result['Confirmed'][this_week] = program.events.where('state = ?', :confirmed).count
     result['Unconfirmed'][this_week] = program.events.where('state = ?', :unconfirmed).count
     result['Submitted'] = program.events.select(:week).group(:week).count
diff --git a/app/models/event.rb b/app/models/event.rb
index ea9ab7fbf..f72e3b3a2 100644
--- a/app/models/event.rb
+++ b/app/models/event.rb
@@ -440,7 +440,7 @@ def before_end_of_conference
     return if submitter&.is_admin?
 
     if program.conference&.end_date &&
-       (Date.today > program.conference.end_date)
+       (Time.zone.today > program.conference.end_date)
       errors
         .add(:created_at, "can't be after the conference end date!")
     end
diff --git a/app/models/user.rb b/app/models/user.rb
index bfa75bb97..6795563fa 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -107,10 +107,10 @@ def for_registration(conference)
 
   # scopes for user distributions
   scope :recent, lambda {
-    where('last_sign_in_at > ?', Date.today - 3.months).where(is_disabled: false)
+    where('last_sign_in_at > ?', Time.zone.today - 3.months).where(is_disabled: false)
   }
   scope :unconfirmed, -> { where('confirmed_at IS NULL') }
-  scope :dead, -> { where('last_sign_in_at < ?', Date.today - 1.year) }
+  scope :dead, -> { where('last_sign_in_at < ?', Time.zone.today - 1.year) }
 
   # Include default devise modules. Others available are:
   # :token_authenticatable, :confirmable,
diff --git a/app/views/conference_registrations/show.html.haml b/app/views/conference_registrations/show.html.haml
index 88e4fac45..8eaaf332c 100644
--- a/app/views/conference_registrations/show.html.haml
+++ b/app/views/conference_registrations/show.html.haml
@@ -124,13 +124,13 @@
     .col-md-12
       - if @registration
         .btn-group-vertical.pull-right
-          = link_to 'Edit your Registration', edit_conference_conference_registration_path(@conference.short_title), class: 'btn btn-success', disabled: @conference.end_date < Date.today
+          = link_to 'Edit your Registration', edit_conference_conference_registration_path(@conference.short_title), class: 'btn btn-success', disabled: @conference.end_date < Time.zone.today
           - if @purchases.any?
             = link_to 'Unregister', conference_conference_registration_path(@conference.short_title), method: :delete, class: 'btn btn-danger btn-xs',
-              data: { confirm: "Your ticket purchases won't be refunded. Are you sure you want to unregister?" }, disabled: @conference.end_date < Date.today
+              data: { confirm: "Your ticket purchases won't be refunded. Are you sure you want to unregister?" }, disabled: @conference.end_date < Time.zone.today
           - else
             = link_to 'Unregister', conference_conference_registration_path(@conference.short_title), method: :delete, class: 'btn btn-danger btn-xs',
-              data: { confirm: "You haven't purchased any ticket. Are you sure you want to unregister?" }, disabled: @conference.end_date < Date.today
+              data: { confirm: "You haven't purchased any ticket. Are you sure you want to unregister?" }, disabled: @conference.end_date < Time.zone.today
       - else
         = link_to 'Register', new_conference_conference_registration_path(@conference.short_title), class: 'btn btn-success btn-lg pull-right'
 
diff --git a/spec/controllers/admin/cfps_controller_spec.rb b/spec/controllers/admin/cfps_controller_spec.rb
index fc52d34e6..ee6ed65eb 100644
--- a/spec/controllers/admin/cfps_controller_spec.rb
+++ b/spec/controllers/admin/cfps_controller_spec.rb
@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 describe Admin::CfpsController do
-  let!(:today) { Date.today }
+  let!(:today) { Time.zone.today }
   let!(:conference) { create(:conference, start_date: today + 20.days, end_date: today + 30.days) }
   let!(:organizer) { create(:organizer, resource: conference) }
   let(:cfp) { create(:cfp, program: conference.program) }
diff --git a/spec/controllers/admin/conferences_controller_spec.rb b/spec/controllers/admin/conferences_controller_spec.rb
index c91bbacf9..e81a4bac1 100644
--- a/spec/controllers/admin/conferences_controller_spec.rb
+++ b/spec/controllers/admin/conferences_controller_spec.rb
@@ -48,8 +48,8 @@
           conference.email_settings = create(:email_settings)
           patch :update,
                 params: { id:         conference.short_title,
-                          conference: attributes_for(:conference, start_date: Date.today + 2.days,
-                                                                  end_date:   Date.today + 4.days) }
+                          conference: attributes_for(:conference, start_date: Time.zone.today + 2.days,
+                                                                  end_date:   Time.zone.today + 4.days) }
           conference.reload
           allow(Mailbot).to receive(:conference_date_update_mail).and_return(mailer)
         end
diff --git a/spec/controllers/admin/registration_periods_controller_spec.rb b/spec/controllers/admin/registration_periods_controller_spec.rb
index 182324dc0..833ad76d1 100644
--- a/spec/controllers/admin/registration_periods_controller_spec.rb
+++ b/spec/controllers/admin/registration_periods_controller_spec.rb
@@ -47,13 +47,13 @@
           allow(mailer).to receive(:deliver)
           conference.email_settings = create(:email_settings)
           conference.registration_period = create(:registration_period,
-                                                  start_date: Date.today,
-                                                  end_date:   Date.today + 2.days)
+                                                  start_date: Time.zone.today,
+                                                  end_date:   Time.zone.today + 2.days)
 
           patch :update, params: { conference_id: conference.short_title, registration_period:
                          attributes_for(:registration_period,
-                                        start_date: Date.today + 2.days,
-                                        end_date:   Date.today + 4.days) }
+                                        start_date: Time.zone.today + 2.days,
+                                        end_date:   Time.zone.today + 4.days) }
           conference.reload
           allow(Mailbot).to receive(:conference_registration_date_update_mail).and_return(mailer)
         end
diff --git a/spec/factories/conferences.rb b/spec/factories/conferences.rb
index 5c1f9377a..5cad2918e 100644
--- a/spec/factories/conferences.rb
+++ b/spec/factories/conferences.rb
@@ -42,7 +42,7 @@
     title { Faker::Book.title }
     short_title { SecureRandom.urlsafe_base64(4) }
     timezone { Faker::Address.time_zone }
-    start_date { Date.today }
+    start_date { Time.zone.today }
     end_date { 6.days.from_now }
     start_hour { 9 }
     end_hour { 20 }
diff --git a/spec/factories/tracks.rb b/spec/factories/tracks.rb
index fe6664e99..4547d6107 100644
--- a/spec/factories/tracks.rb
+++ b/spec/factories/tracks.rb
@@ -42,8 +42,8 @@
       association :submitter, factory: :user
       state { 'new' }
       cfp_active { false }
-      start_date { Date.today }
-      end_date { Date.today }
+      start_date { Time.zone.today }
+      end_date { Time.zone.today }
       room
       relevance { Faker::Hipster.paragraph(sentence_count: 2) }
     end
diff --git a/spec/factories/users.rb b/spec/factories/users.rb
index f9135376c..165a85fab 100644
--- a/spec/factories/users.rb
+++ b/spec/factories/users.rb
@@ -79,7 +79,7 @@
       Quisque cursus facilisis consequat. Etiam volutpat ligula turpis, at
       gravida.
     EOS
-    last_sign_in_at { Date.today }
+    last_sign_in_at { Time.zone.today }
     is_disabled { false }
 
     # Called by every user creation
diff --git a/spec/factories/vdays.rb b/spec/factories/vdays.rb
index b7932e074..f8e6cc0d3 100644
--- a/spec/factories/vdays.rb
+++ b/spec/factories/vdays.rb
@@ -13,7 +13,7 @@
 #
 FactoryBot.define do
   factory :vday do
-    day { Date.today }
+    day { Time.zone.today }
     description { 'Lorem Ipsum dolsum' }
     conference
   end
diff --git a/spec/features/conference_spec.rb b/spec/features/conference_spec.rb
index eb00a0799..25780953e 100644
--- a/spec/features/conference_spec.rb
+++ b/spec/features/conference_spec.rb
@@ -19,7 +19,7 @@
 
       select('(GMT+01:00) Berlin', from: 'conference[timezone]')
 
-      today = Date.today - 1
+      today = Time.zone.today - 1
       page
         .execute_script("$('#conference-start-datepicker').val('" +
                          "#{today.strftime('%d/%m/%Y')}')")
@@ -50,7 +50,7 @@
       fill_in 'conference_title', with: 'New Con'
       fill_in 'conference_short_title', with: 'NewCon'
 
-      day = Date.today + 10
+      day = Time.zone.today + 10
       page
         .execute_script("$('#conference-start-datepicker').val('" +
                              "#{day.strftime('%d/%m/%Y')}')")
diff --git a/spec/features/registration_periods_spec.rb b/spec/features/registration_periods_spec.rb
index 1b6b4a901..d1a9aa7fd 100644
--- a/spec/features/registration_periods_spec.rb
+++ b/spec/features/registration_periods_spec.rb
@@ -6,8 +6,8 @@
   # It is necessary to use bang version of let to build roles before user
   let!(:conference) { create(:conference) }
   let!(:organizer) { create(:organizer, email: 'admin@example.com', resource: conference) }
-  let(:start_date) { Date.today }
-  let(:end_date) { Date.today + 5 }
+  let(:start_date) { Time.zone.today }
+  let(:end_date) { Time.zone.today + 5 }
 
   context 'as organizer' do
     before do
diff --git a/spec/features/versions_spec.rb b/spec/features/versions_spec.rb
index 861abcf08..bd50bdc07 100644
--- a/spec/features/versions_spec.rb
+++ b/spec/features/versions_spec.rb
@@ -35,8 +35,8 @@
   end
 
   it 'display changes in cfp', feature: true, versioning: true, js: true do
-    cfp.update(start_date: (Date.today + 1).strftime('%d/%m/%Y'),
-               end_date:   (Date.today + 3).strftime('%d/%m/%Y'))
+    cfp.update(start_date: (Time.zone.today + 1).strftime('%d/%m/%Y'),
+               end_date:   (Time.zone.today + 3).strftime('%d/%m/%Y'))
     cfp_id = cfp.id
     cfp.destroy
 
@@ -48,8 +48,8 @@
 
   it 'display changes in registration_period', feature: true, versioning: true, js: true do
     registration_period = create(:registration_period, conference: conference)
-    registration_period.update(start_date: (Date.today + 1).strftime('%d/%m/%Y'),
-                               end_date:   (Date.today + 3).strftime('%d/%m/%Y'))
+    registration_period.update(start_date: (Time.zone.today + 1).strftime('%d/%m/%Y'),
+                               end_date:   (Time.zone.today + 3).strftime('%d/%m/%Y'))
     registration_period_id = registration_period.id
     registration_period.destroy
 
diff --git a/spec/models/cfp_spec.rb b/spec/models/cfp_spec.rb
index f85b9e876..a500938d4 100644
--- a/spec/models/cfp_spec.rb
+++ b/spec/models/cfp_spec.rb
@@ -19,9 +19,9 @@
 describe Cfp do
   subject { create(:cfp) }
 
-  let!(:conference) { create(:conference, end_date: Date.today) }
+  let!(:conference) { create(:conference, end_date: Time.zone.today) }
   let!(:cfp) do
-    create(:cfp, cfp_type: 'events', start_date: Date.today - 2, end_date: Date.today - 1,
+    create(:cfp, cfp_type: 'events', start_date: Time.zone.today - 2, end_date: Time.zone.today - 1,
    program_id: conference.program.id)
   end
 
@@ -45,7 +45,7 @@
 
   describe '.for_tracks' do
     it 'returns the cfp for tracks when it exists' do
-      call_for_tracks = create(:cfp, cfp_type: 'tracks', program: conference.program, end_date: Date.today)
+      call_for_tracks = create(:cfp, cfp_type: 'tracks', program: conference.program, end_date: Time.zone.today)
       expect(conference.program.cfps.for_tracks).to eq call_for_tracks
     end
 
@@ -57,12 +57,12 @@
   describe '#before_end_of_conference' do
     describe 'fails to save cfp' do
       it 'when cfp end_date is after conference end_date' do
-        cfp.end_date = Date.today + 1
+        cfp.end_date = Time.zone.today + 1
         expect(cfp.valid?).to be false
       end
 
       it 'when cfp start_date is after conference end_date' do
-        cfp.start_date = Date.today + 1
+        cfp.start_date = Time.zone.today + 1
         expect(cfp.valid?).to be false
       end
     end
@@ -80,7 +80,7 @@
     end
 
     it 'fails when cfp start_date is after cfp end_date' do
-      cfp.start_date = Date.today
+      cfp.start_date = Time.zone.today
       expect(cfp.valid?).to be false
     end
   end
@@ -98,14 +98,14 @@
 
     describe 'returns true' do
       it 'when end_date changed' do
-        cfp.end_date = Date.today
+        cfp.end_date = Time.zone.today
         expect(cfp.start_date_changed?).to be false
         expect(cfp.end_date_changed?).to be true
         expect(cfp.notify_on_cfp_date_update?).to be true
       end
 
       it 'when start_date changed' do
-        cfp.start_date = Date.today
+        cfp.start_date = Time.zone.today
         expect(cfp.end_date_changed?).to be false
         expect(cfp.start_date_changed?).to be true
         expect(cfp.notify_on_cfp_date_update?).to be true
@@ -122,7 +122,7 @@
       it 'when send_on_cfp_dates_updates is not set' do
         conference.email_settings.send_on_cfp_dates_updated = false
         conference.email_settings.save!
-        cfp.end_date = Date.today
+        cfp.end_date = Time.zone.today
 
         expect(cfp.end_date_changed?).to be true
         expect(cfp.notify_on_cfp_date_update?).to be false
@@ -131,7 +131,7 @@
       it 'when cfp_dates_updates_subject is not set' do
         conference.email_settings.cfp_dates_updated_subject = ''
         conference.email_settings.save!
-        cfp.end_date = Date.today
+        cfp.end_date = Time.zone.today
 
         expect(cfp.end_date_changed?).to be true
         expect(cfp.notify_on_cfp_date_update?).to be false
@@ -140,7 +140,7 @@
       it 'when cfp_dates_updates_template is not set' do
         conference.email_settings.cfp_dates_updated_body = ''
         conference.email_settings.save!
-        cfp.end_date = Date.today
+        cfp.end_date = Time.zone.today
 
         expect(cfp.end_date_changed?).to be true
         expect(cfp.notify_on_cfp_date_update?).to be false
diff --git a/spec/models/conference_spec.rb b/spec/models/conference_spec.rb
index e96d69fac..9f2f9956b 100644
--- a/spec/models/conference_spec.rb
+++ b/spec/models/conference_spec.rb
@@ -72,11 +72,11 @@
   describe '#write_event_distribution_to_db' do
     it 'updates pending conferences' do
       create(:conference,
-             start_date: Date.today - 2.weeks,
-             end_date:   Date.today - 1.week)
+             start_date: Time.zone.today - 2.weeks,
+             end_date:   Time.zone.today - 1.week)
 
-      subject.start_date = Date.today + 1.week
-      subject.end_date = Date.today + 2.weeks
+      subject.start_date = Time.zone.today + 1.week
+      subject.end_date = Time.zone.today + 2.weeks
 
       result = {
         DateTime.now.end_of_week =>
@@ -97,8 +97,8 @@
 
     it 'does not update past conferences' do
       old_conference = create(:conference,
-                              start_date: Date.today - 2.weeks,
-                              end_date:   Date.today - 1.week)
+                              start_date: Time.zone.today - 2.weeks,
+                              end_date:   Time.zone.today - 1.week)
 
       Conference.write_event_distribution_to_db
       old_conference.reload
@@ -107,12 +107,12 @@
 
     it 'computes the correct result' do
       subject.email_settings = create(:email_settings)
-      subject.start_date = Date.today + 6.weeks
-      subject.end_date = Date.today + 7.weeks
+      subject.start_date = Time.zone.today + 6.weeks
+      subject.end_date = Time.zone.today + 7.weeks
       subject.save
-      create(:cfp, start_date: Date.today - 3.weeks, program: subject.program)
+      create(:cfp, start_date: Time.zone.today - 3.weeks, program: subject.program)
 
-      create(:event, program: subject.program, created_at: Date.today)
+      create(:event, program: subject.program, created_at: Time.zone.today)
       options = {}
       options[:send_mail] = 'false'
 
@@ -153,8 +153,8 @@
 
     it 'does not overwrite old entries' do
       subject.email_settings = create(:email_settings)
-      subject.start_date = Date.today + 6.weeks
-      subject.end_date = Date.today + 7.weeks
+      subject.start_date = Time.zone.today + 6.weeks
+      subject.end_date = Time.zone.today + 7.weeks
       db_data = {
         DateTime.now.end_of_week - 2.weeks =>
                                               {
@@ -177,9 +177,9 @@
       }
       subject.events_per_week = db_data
       subject.save
-      create(:cfp, start_date: Date.today - 3.weeks, program: subject.program)
+      create(:cfp, start_date: Time.zone.today - 3.weeks, program: subject.program)
 
-      create(:event, program: subject.program, created_at: Date.today)
+      create(:event, program: subject.program, created_at: Time.zone.today)
       unconfirmed = create(:event, program: subject.program)
       confirmed = create(:event, program: subject.program)
       options = {}
@@ -231,16 +231,16 @@
     end
 
     it 'calculates the correct result with data from database' do
-      subject.start_date = Date.today + 6.weeks
-      subject.end_date = Date.today + 7.weeks
+      subject.start_date = Time.zone.today + 6.weeks
+      subject.end_date = Time.zone.today + 7.weeks
 
       # Inject last two weeks to database
       db_data = {
-        Date.today.end_of_week - 2.weeks => {
+        Time.zone.today.end_of_week - 2.weeks => {
           confirmed:   1,
           unconfirmed: 2
         },
-        Date.today.end_of_week - 1.week  => {
+        Time.zone.today.end_of_week - 1.week  => {
           confirmed:   3,
           unconfirmed: 4
         }
@@ -248,9 +248,9 @@
       subject.events_per_week = db_data
 
       subject.save
-      create(:cfp, start_date: Date.today - 2.weeks, program: subject.program)
+      create(:cfp, start_date: Time.zone.today - 2.weeks, program: subject.program)
 
-      create(:event, program: subject.program, created_at: Date.today - 2.weeks)
+      create(:event, program: subject.program, created_at: Time.zone.today - 2.weeks)
 
       result = [{ name: 'Submitted', data: { 'Wk 1' => 1, 'Wk 2' => 1, 'Wk 3' => 1 } },
                 { name: 'Confirmed', data: { 'Wk 1' => 1, 'Wk 2' => 3, 'Wk 3' => 0 } }, { name: 'Unconfirmed', data: { 'Wk 1' => 2, 'Wk 2' => 4, 'Wk 3' => 0 } }]
@@ -258,10 +258,10 @@
     end
 
     it 'calculates the correct result without data from database' do
-      subject.start_date = Date.today + 6.weeks
-      subject.end_date = Date.today + 7.weeks
+      subject.start_date = Time.zone.today + 6.weeks
+      subject.end_date = Time.zone.today + 7.weeks
       subject.save
-      create(:cfp, start_date: Date.today, program: subject.program)
+      create(:cfp, start_date: Time.zone.today, program: subject.program)
       create(:event, program: subject.program)
 
       result = [
@@ -274,12 +274,12 @@
 
     it 'pads left correct' do
       subject.email_settings = create(:email_settings)
-      subject.start_date = Date.today + 6.weeks
-      subject.end_date = Date.today + 7.weeks
+      subject.start_date = Time.zone.today + 6.weeks
+      subject.end_date = Time.zone.today + 7.weeks
       subject.save
-      create(:cfp, start_date: Date.today - 3.weeks, program: subject.program)
+      create(:cfp, start_date: Time.zone.today - 3.weeks, program: subject.program)
 
-      create(:event, program: subject.program, created_at: Date.today)
+      create(:event, program: subject.program, created_at: Time.zone.today)
       unconfirmed = create(:event, program: subject.program)
       confirmed = create(:event, program: subject.program)
       options = {}
@@ -306,16 +306,16 @@
     end
 
     it 'calculates correct with missing weeks' do
-      subject.start_date = Date.today + 6.weeks
-      subject.end_date = Date.today + 7.weeks
+      subject.start_date = Time.zone.today + 6.weeks
+      subject.end_date = Time.zone.today + 7.weeks
 
       # Inject last two weeks to database
       db_data = {
-        Date.today.end_of_week - 3.weeks => {
+        Time.zone.today.end_of_week - 3.weeks => {
           confirmed:   1,
           unconfirmed: 2
         },
-        Date.today.end_of_week - 1.week  => {
+        Time.zone.today.end_of_week - 1.week  => {
           confirmed:   3,
           unconfirmed: 4
         }
@@ -323,9 +323,9 @@
       subject.events_per_week = db_data
 
       subject.save
-      create(:cfp, start_date: Date.today - 3.weeks, program: subject.program)
+      create(:cfp, start_date: Time.zone.today - 3.weeks, program: subject.program)
 
-      create(:event, program: subject.program, created_at: Date.today - 3.weeks)
+      create(:event, program: subject.program, created_at: Time.zone.today - 3.weeks)
 
       result = [
         {
@@ -1027,8 +1027,8 @@
 
     it 'calculates correct for conference with registration, cfp, venue, rooms' do
       subject.registration_period = create(:registration_period,
-                                           start_date: Date.today,
-                                           end_date: Date.today + 14, conference: subject)
+                                           start_date: Time.zone.today,
+                                           end_date: Time.zone.today + 14, conference: subject)
       create(:cfp, program: subject.program)
       subject.venue = create(:venue, conference: subject)
       subject.venue.rooms = [create(:room, venue: subject.venue)]
@@ -1051,8 +1051,8 @@
       subject.venue.rooms = [create(:room, venue: subject.venue)]
       subject.program.tracks = [create(:track)]
       subject.registration_period = create(:registration_period,
-                                           start_date: Date.today,
-                                           end_date: Date.today + 14, conference: subject)
+                                           start_date: Time.zone.today,
+                                           end_date: Time.zone.today + 14, conference: subject)
       create(:cfp, program: subject.program)
       subject.program.event_types = []
       subject.program.difficulty_levels = []
@@ -1073,8 +1073,8 @@
       subject.program.tracks = [create(:track)]
       subject.program.event_types = [create(:event_type)]
       subject.registration_period = create(:registration_period,
-                                           start_date: Date.today,
-                                           end_date: Date.today + 14, conference: subject)
+                                           start_date: Time.zone.today,
+                                           end_date: Time.zone.today + 14, conference: subject)
       create(:cfp, program: subject.program)
       subject.venue = create(:venue, conference: subject)
       subject.venue.rooms = [create(:room, venue: subject.venue)]
@@ -1097,8 +1097,8 @@
       subject.program.event_types = [create(:event_type)]
       subject.program.difficulty_levels = [create(:difficulty_level)]
       subject.registration_period = create(:registration_period,
-                                           start_date: Date.today,
-                                           end_date: Date.today + 14, conference: subject)
+                                           start_date: Time.zone.today,
+                                           end_date: Time.zone.today + 14, conference: subject)
       create(:cfp, program: subject.program)
       subject.venue = create(:venue, conference: subject)
       subject.venue.rooms = [create(:room, venue: subject.venue)]
@@ -1370,14 +1370,14 @@
   describe '#pending?' do
     context 'is pending' do
       it '#pending? is true' do
-        subject.start_date = Date.today + 10
+        subject.start_date = Time.zone.today + 10
         expect(subject.pending?).to be true
       end
     end
 
     context 'is not pending' do
       it '#pending? is false' do
-        subject.start_date = Date.today - 10
+        subject.start_date = Time.zone.today - 10
         expect(subject.pending?).to be false
       end
     end
@@ -1392,10 +1392,10 @@
 
     context 'open registration' do
       before do
-        subject.end_date = Date.today + 7
+        subject.end_date = Time.zone.today + 7
         enrollment = create(:registration_period,
-                            start_date: Date.today - 1,
-                            end_date: Date.today + 7, conference: subject)
+                            start_date: Time.zone.today - 1,
+                            end_date: Time.zone.today + 7, conference: subject)
         subject.registration_period = enrollment
       end
 
diff --git a/spec/models/event_spec.rb b/spec/models/event_spec.rb
index 72f7d0462..6c6bab33e 100644
--- a/spec/models/event_spec.rb
+++ b/spec/models/event_spec.rb
@@ -133,7 +133,7 @@
     describe '#before_end_of_conference' do
       context 'is invalid' do
         it 'when event is created after the conference end_date, and returns an error message' do
-          conference = create(:conference, start_date: Date.today - 1, end_date: Date.today - 1)
+          conference = create(:conference, start_date: Time.zone.today - 1, end_date: Time.zone.today - 1)
           new_event = build(:event, program: conference.program)
           expect(new_event.valid?).to be false
           expect(new_event.errors[:created_at]).to eq ["can't be after the conference end date!"]
@@ -142,7 +142,7 @@
 
       context 'is valid' do
         it 'when event is created before the conference end_date' do
-          conference = create(:conference, start_date: Date.today - 1, end_date: Date.today + 1)
+          conference = create(:conference, start_date: Time.zone.today - 1, end_date: Time.zone.today + 1)
           new_event = build(:event, program: conference.program)
           expect(new_event.valid?).to be true
         end
diff --git a/spec/models/program_spec.rb b/spec/models/program_spec.rb
index a62f13244..453aeed1c 100644
--- a/spec/models/program_spec.rb
+++ b/spec/models/program_spec.rb
@@ -68,29 +68,29 @@
 
     describe 'voting_start_date_before_end_date' do
       it 'is valid, when voting_start_date is the same day as voting_end_date' do
-        expect(build(:program, voting_start_date: Date.today, voting_end_date: Date.today)).to be_valid
+        expect(build(:program, voting_start_date: Time.zone.today, voting_end_date: Time.zone.today)).to be_valid
       end
 
       it 'is valid, when voting_start_date is before voting_end_date' do
-        expect(build(:program, voting_start_date: Date.today, voting_end_date: Date.today + 1)).to be_valid
+        expect(build(:program, voting_start_date: Time.zone.today, voting_end_date: Time.zone.today + 1)).to be_valid
       end
 
       it 'is not valid, when voting_start_date is after voting_end_date' do
-        expect(build(:program, voting_start_date: Date.today, voting_end_date: Date.today - 1)).not_to be_valid
+        expect(build(:program, voting_start_date: Time.zone.today, voting_end_date: Time.zone.today - 1)).not_to be_valid
       end
     end
 
     describe 'voting_dates_exist' do
       it 'is valid, when both voting_start_date and voting_end_date are set' do
-        expect(build(:program, voting_start_date: Date.today, voting_end_date: Date.today + 1)).to be_valid
+        expect(build(:program, voting_start_date: Time.zone.today, voting_end_date: Time.zone.today + 1)).to be_valid
       end
 
       it 'is invalid, when voting_start_date is not set' do
-        expect(build(:program, voting_end_date: Date.today)).not_to be_valid
+        expect(build(:program, voting_end_date: Time.zone.today)).not_to be_valid
       end
 
       it 'is invalid, when voting_end_date is not set' do
-        expect(build(:program, voting_start_date: Date.today)).not_to be_valid
+        expect(build(:program, voting_start_date: Time.zone.today)).not_to be_valid
       end
     end
   end
@@ -113,12 +113,12 @@
       end
 
       it 'returns true if voting period is over' do
-        program.voting_end_date = Date.today - 1
+        program.voting_end_date = Time.zone.today - 1
         expect(program.show_voting?).to be true
       end
 
       it 'returns false if we are still in votig period' do
-        program.voting_end_date = Date.today + 1
+        program.voting_end_date = Time.zone.today + 1
         expect(program.show_voting?).to be false
       end
     end
@@ -140,10 +140,10 @@
     end
 
     context 'voting dates are set' do
-      it_behaves_like 'voting period', Date.today - 1, Date.today + 1, true
-      it_behaves_like 'voting period', Date.today - 1, 1.hour.from_now, true
-      it_behaves_like 'voting period', Date.today - 2, Date.today - 1, false
-      it_behaves_like 'voting period', Date.today - 1, 1.minute.ago, false
+      it_behaves_like 'voting period', Time.zone.today - 1, Time.zone.today + 1, true
+      it_behaves_like 'voting period', Time.zone.today - 1, 1.hour.from_now, true
+      it_behaves_like 'voting period', Time.zone.today - 2, Time.zone.today - 1, false
+      it_behaves_like 'voting period', Time.zone.today - 1, 1.minute.ago, false
     end
   end
 
diff --git a/spec/models/registration_period_spec.rb b/spec/models/registration_period_spec.rb
index a3b93fe75..7a32d2766 100644
--- a/spec/models/registration_period_spec.rb
+++ b/spec/models/registration_period_spec.rb
@@ -14,10 +14,10 @@
 require 'spec_helper'
 
 describe RegistrationPeriod do
-  let!(:conference) { create(:conference, start_date: Date.today, end_date: Date.today + 6) }
+  let!(:conference) { create(:conference, start_date: Time.zone.today, end_date: Time.zone.today + 6) }
   let!(:registration_ticket) { create(:registration_ticket, conference: conference) }
   let!(:registration_period) do
-    create(:registration_period, start_date: Date.today - 2, end_date: Date.today - 1, conference: conference)
+    create(:registration_period, start_date: Time.zone.today - 2, end_date: Time.zone.today - 1, conference: conference)
   end
 
   describe 'validations' do
diff --git a/spec/models/track_spec.rb b/spec/models/track_spec.rb
index a054de04b..be722e871 100644
--- a/spec/models/track_spec.rb
+++ b/spec/models/track_spec.rb
@@ -132,7 +132,7 @@
         end
 
         it 'when the track\'s end date is after the conference\'s end date' do
-          track = build(:track, start_date: Date.today, end_date: 3.days.from_now, program: @conference.program)
+          track = build(:track, start_date: Time.zone.today, end_date: 3.days.from_now, program: @conference.program)
           expect(track.valid?).to be false
           expect(track.errors[:end_date]).to eq ["can't be outside of the conference's dates (#{1.day.ago.to_date}-#{2.days.from_now.to_date})"]
         end
@@ -146,7 +146,7 @@
 
       context 'is valid' do
         it 'when the track\'s start date is before its end date' do
-          track = build(:track, start_date: Date.today, end_date: Date.tomorrow, program: @conference.program)
+          track = build(:track, start_date: Time.zone.today, end_date: Date.tomorrow, program: @conference.program)
           expect(track.valid?).to be true
         end
       end
diff --git a/spec/models/user_spec.rb b/spec/models/user_spec.rb
index 151acca47..b870c4789 100644
--- a/spec/models/user_spec.rb
+++ b/spec/models/user_spec.rb
@@ -145,7 +145,7 @@
 
     describe 'user distribution scopes' do
       it 'scopes recent users' do
-        create(:user, last_sign_in_at: Date.today - 3.months + 1.day) # active
+        create(:user, last_sign_in_at: Time.zone.today - 3.months + 1.day) # active
         expect(User.recent.count).to eq(1)
       end