bitcrowd · andreasknoepfle · Mar 4, 2025 · Mar 3, 2025 · Mar 3, 2025 · Mar 3, 2025
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## Unreleased
+
+### Added
+
+- :timezone to navigation protocol
+
 ## [1.17.0] - 2024-08-09
 
 ### Changed

diff --git a/lib/chromic_pdf/pdf/protocols/navigate.ex b/lib/chromic_pdf/pdf/protocols/navigate.ex
@@ -12,6 +12,17 @@ defmodule ChromicPDF.Navigate do
       await_response(:cookie_set, [])
     end
 
+    if_option :timezone do
+      call(
+        :timezone,
+        "Emulation.setTimezoneOverride",
+        &%{"timezoneId" => Map.fetch!(&1, :timezone)},
+        %{}
+      )
+
+      await_response(:timezone_set, [])
+    end
+
     if_option {:source_type, :html} do
       call(:get_frame_tree, "Page.getFrameTree", [], %{})
       await_response(:frame_tree, [{["frameTree", "frame", "id"], "frameId"}])

diff --git a/lib/chromic_pdf/supervisor.ex b/lib/chromic_pdf/supervisor.ex
@@ -184,6 +184,7 @@ defmodule ChromicPDF.Supervisor do
               | {:assigns, map()}
               | evaluate_option()
               | wait_for_option()
+              | {:timezone, String.t()}
 
       @type pdf_option ::
               {:print_to_pdf, map()}

diff --git a/test/integration/pdf_generation_test.exs b/test/integration/pdf_generation_test.exs
@@ -394,6 +394,25 @@ defmodule ChromicPDF.PDFGenerationTest do
     end
   end
 
+  describe "timezone can be set thru print_to_pdf/2" do
+    setup do
+      start_supervised!({ChromicPDF, offline: false})
+      start_supervised!(TestServer.bandit(:http))
+
+      %{port: TestServer.port(:http)}
+    end
+
+    @tag :disable_logger
+    test "timezone can be set", %{port: port} do
+      input = {:url, "http://localhost:#{port}/timezone_echo"}
+
+      print_to_pdf(input, [timezone: "America/New_York"], fn text ->
+        text = text |> String.trim() |> Jason.decode!()
+        assert text == %{"timezoneId" => "America/New_York"}
+      end)
+    end
+  end
+
   describe "certificate error handling" do
     setup do
       start_supervised!(ChromicPDF)

diff --git a/test/integration/support/test_server.ex b/test/integration/support/test_server.ex
@@ -33,6 +33,21 @@ defmodule ChromicPDF.TestServer do
     send_resp(conn, 200, inspect(conn.req_cookies))
   end
 
+  get "/timezone_echo" do
+    body = """
+    <html>
+      <body>
+        <span id="timezone"></span>
+        <script>
+          document.getElementById("timezone").innerText = JSON.stringify({ timezoneId: Intl.DateTimeFormat().resolvedOptions().timeZone });
+        </script>
+      </body>
+    </html>
+    """
+
+    send_resp(conn, 200, body)
+  end
+
   get "/with_plug" do
     ChromicPDF.Plug.call(conn, [])
   end