FEAT: Added IANA timezone name to place context

.changeset/itchy-areas-help.md

@@ -0,0 +1,5 @@
+---
+"@adobe/alloy": patch
+---
+
+Include IANA timezone on the place context

packages/core/src/components/Context/injectPlaceContext.js

@@ -28,6 +28,10 @@ export default (dateProvider) => {
     ) {
       placeContext.localTime = toISOStringLocal(date);
     }
+    const ianaTimezone = Intl.DateTimeFormat().resolvedOptions().timeZone;
+    if (ianaTimezone) {
+      placeContext.ianaTimezone = ianaTimezone;
+    }
 
     event.mergeXdm({ placeContext });
   };

packages/core/test/unit/specs/components/Context/injectPlaceContext.spec.js

@@ -10,10 +10,18 @@ OF ANY KIND, either express or implied. See the License for the specific languag
 governing permissions and limitations under the License.
 */
 
-import { vi, describe, it, expect } from "vitest";
+import { vi, describe, it, expect, beforeEach } from "vitest";
 import injectPlaceContext from "../../../../../src/components/Context/injectPlaceContext.js";
 
 describe("Context::injectPlaceContext", () => {
+  beforeEach(() => {
+    vi.spyOn(Intl, "DateTimeFormat").mockImplementation(() => {
+      return {
+        resolvedOptions: () => ({ timeZone: "" }),
+      };
+    });
+  });
+
   it("adds placeContext", () => {
     const date = new Date("March 25, 2019 21:56:18");
     vi.spyOn(date, "getTimezoneOffset").mockReturnValue(7 * 60);
@@ -72,4 +80,28 @@ describe("Context::injectPlaceContext", () => {
       },
     });
   });
+  it("includes ianaTimezone when Intl reports a timezone", () => {
+    vi.mocked(Intl.DateTimeFormat).mockImplementation(() => {
+      return {
+        resolvedOptions: () => ({ timeZone: "America/New_York" }),
+      };
+    });
+    const date = new Date("March 25, 2019 21:56:18");
+    vi.spyOn(date, "getTimezoneOffset").mockReturnValue(4 * 60);
+    const event = { mergeXdm: vi.fn() };
+    injectPlaceContext(() => date)(event);
+    expect(event.mergeXdm).toHaveBeenCalledWith({
+      placeContext: expect.objectContaining({
+        ianaTimezone: "America/New_York",
+      }),
+    });
+  });
+  it("omits ianaTimezone when Intl reports an empty timezone", () => {
+    const date = new Date("March 25, 2019 21:56:18");
+    vi.spyOn(date, "getTimezoneOffset").mockReturnValue(4 * 60);
+    const event = { mergeXdm: vi.fn() };
+    injectPlaceContext(() => date)(event);
+    const placeContext = event.mergeXdm.mock.calls[0][0].placeContext;
+    expect(placeContext).not.toHaveProperty("ianaTimezone");
+  });
 });