Render Datetime ingredient in local time zone.

Datetime values are stored in UTC in the database.
We need to render them in the local timezone.

(cherry picked from commit 226c97f)

app/components/alchemy/ingredients/datetime_view.rb

@@ -11,10 +11,11 @@ def initialize(ingredient, date_format: nil, html_options: {})
       end
 
       def call
+        datetime = ingredient.value.in_time_zone(Rails.application.config.time_zone)
         if date_format == "rfc822"
-          ingredient.value.to_s(:rfc822)
+          datetime.try(:to_s, :rfc822) || datetime.try(:to_fs, :rfc822)
         else
-          ::I18n.l(ingredient.value, format: date_format)
+          ::I18n.l(datetime, format: date_format)
         end.html_safe
       end
     end

spec/models/alchemy/ingredients/datetime_spec.rb

@@ -17,13 +17,17 @@
   end
 
   describe "value" do
-    subject { datetime_ingredient.value }
+    subject(:value) { datetime_ingredient.value }
 
     it "returns a time object" do
       is_expected.to be_an(Time)
       is_expected.to eq("01.04.2021")
     end
 
+    it "timezone is UTC" do
+      expect(value.zone).to eq("UTC")
+    end
+
     context "without value" do
       let(:datetime_ingredient) do
         described_class.new(

spec/views/alchemy/ingredients/datetime_view_spec.rb

@@ -3,7 +3,17 @@
 require "rails_helper"
 
 describe "alchemy/ingredients/_datetime_view" do
-  let(:ingredient) { Alchemy::Ingredients::Datetime.new(value: "2013-10-27 21:14:16 +0100") }
+  around do |example|
+    time_zone = Rails.application.config.time_zone
+    Rails.application.config.time_zone = "Berlin"
+    example.run
+    Rails.application.config.time_zone = time_zone
+  end
+
+  let(:ingredient) do
+    Alchemy::Ingredients::Datetime.new(value: "2024-08-29T10:00:00.000Z")
+  end
+
   let(:options) { {} }
 
   before do
@@ -13,17 +23,17 @@
   context "with date value" do
     context "without date_format passed" do
       it "translates the date value with default format" do
-        render ingredient
-        expect(rendered).to have_content("Sun, 27 Oct 2013 20:14:16 +0000")
+        render ingredient, options: options
+        expect(rendered).to have_content("Thu, 29 Aug 2024 12:00:00 +0200")
       end
     end
 
     context "with option date_format set to rfc822" do
       let(:options) { {date_format: "rfc822"} }
 
       it "renders the date rfc822 conform" do
-        render ingredient
-        expect(rendered).to have_content("Sun, 27 Oct 2013 20:14:16 +0000")
+        render ingredient, options: options
+        expect(rendered).to have_content("Thu, 29 Aug 2024 12:00:00 +0200")
       end
     end
   end