diff --git a/vedia.rb b/vedia.rb
index 4b6e308..461ab83 100644
--- a/vedia.rb
+++ b/vedia.rb
@@ -114,6 +114,7 @@ post '/signup' do
     @user.save
     session.clear
     session[:user_id] = @user.id
+    session[:timezone] = params[:timezone]
     redirect '/'
   else
     erb :signup
diff --git a/views/login.erb b/views/login.erb
index 498d53b..e7fed26 100644
--- a/views/login.erb
+++ b/views/login.erb
@@ -16,9 +16,9 @@
     <label for="password" class="form-label"><%= _("Password") %></label>
     <input type="password" name="password" class="form-control">
   </div>
-  <button type="submit" class="btn btn-primary"><%= _("Login") %></button>
   <input type="hidden" name="r" value="<%= @params[:r] %>">
   <input type="hidden" name="timezone" value="UTC">
+  <button type="submit" class="btn btn-primary"><%= _("Login") %></button>
 </form>
 <p><a href="/signup"><%= _("Create account") %></a></p>
 
diff --git a/views/signup.erb b/views/signup.erb
index b833e5a..db3f693 100644
--- a/views/signup.erb
+++ b/views/signup.erb
@@ -28,5 +28,10 @@
     <label for="password" class="form-label"><%= _("Password") %></label>
     <input type="password" name="password" value="<%= params[:password] %>" class="form-control">
   </div>
+  <input type="hidden" name="timezone" value="UTC">
   <button type="submit" class="btn btn-primary"><%= _("Create account") %></button>
 </form>
+
+<script>
+document.signup.timezone.value = Intl.DateTimeFormat().resolvedOptions().timeZone;
+</script>