Add weekday to formatTimeWeekday() (#11020)

src/common/datetime/format_time.ts

@@ -43,9 +43,9 @@ export const formatTimeWeekday = (dateObj: Date, locale: FrontendLocaleData) =>
 const formatTimeWeekdayMem = memoizeOne(
   (locale: FrontendLocaleData) =>
     new Intl.DateTimeFormat(locale.language, {
+      weekday: "long",
       hour: useAmPm(locale) ? "numeric" : "2-digit",
       minute: "2-digit",
-      second: "2-digit",
       hour12: useAmPm(locale),
     })
 );

test/common/datetime/format_time.ts

@@ -3,6 +3,7 @@ import { assert } from "chai";
 import {
   formatTime,
   formatTimeWithSeconds,
+  formatTimeWeekday,
 } from "../../../src/common/datetime/format_time";
 import { NumberFormat, TimeFormat } from "../../../src/data/translation";
 
@@ -51,3 +52,26 @@ describe("formatTimeWithSeconds", () => {
     );
   });
 });
+
+describe("formatTimeWeekday", () => {
+  const dateObj = new Date(2017, 10, 18, 23, 12, 13, 1400);
+
+  it("Formats English times", () => {
+    assert.strictEqual(
+      formatTimeWeekday(dateObj, {
+        language: "en",
+        number_format: NumberFormat.language,
+        time_format: TimeFormat.am_pm,
+      }),
+      "Wednesday 11:12 PM"
+    );
+    assert.strictEqual(
+      formatTimeWeekday(dateObj, {
+        language: "en",
+        number_format: NumberFormat.language,
+        time_format: TimeFormat.twenty_four,
+      }),
+      "Wednesday 23:12"
+    );
+  });
+});