Format the panel and admin date and clock in the stored application timezone

The panel snapshot now carries the admin-saved `timezone` ("" when unset); the coordinator threads it onto the household due-today sensor, and the Party Board and Quest Log cards format their kicker, header and dock date and clock in it, falling back to Home Assistant's zone only when none is stored. The admin app loads the stored zone once (AppTimezoneProvider) and uses it for completion clocks, History day grouping, clocks and lateness, and "today" in Schedule, History and new task defaults; Settings publishes a saved zone app-wide at once. Resolves review finding TZ-001 (task 7e173881). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-30 09:50:25 -04:00
parent e5601811d6
commit cf170214a6
40 changed files with 910 additions and 126 deletions
@@ -0,0 +1,60 @@
+import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
+import { isoDateIn, todayIn, wallClockInstant, zoneOption } from "./zone";
+import { formatClockTime } from "../today/format";
+
+// 13:00 UTC on Sep 23 is already 01:00 on Sep 24 in Auckland (NZST, UTC+12).
+const NOW = new Date("2026-09-23T13:00:00Z");
+
+describe("application timezone helpers (process in UTC)", () => {
+  beforeAll(() => {
+    vi.stubEnv("TZ", "UTC");
+  });
+
+  afterAll(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it("a stored zone decides the calendar date; empty means the browser's zone", () => {
+    expect(todayIn("Pacific/Auckland", NOW)).toBe("2026-09-24");
+    expect(isoDateIn(NOW, "Pacific/Auckland")).toBe("2026-09-24");
+    expect(todayIn("", NOW)).toBe("2026-09-23");
+  });
+
+  it("wall-clock time converts in the stored zone, across its DST change", () => {
+    // NZST (UTC+12) before 27 Sep 2026, NZDT (UTC+13) after.
+    expect(wallClockInstant("2026-09-24", 0, 10, "Pacific/Auckland")).toBe(
+      Date.parse("2026-09-23T12:10:00Z"),
+    );
+    expect(wallClockInstant("2026-09-28", 7, 30, "Pacific/Auckland")).toBe(
+      Date.parse("2026-09-27T18:30:00Z"),
+    );
+    expect(wallClockInstant("2026-09-24", 0, 10, "")).toBe(Date.parse("2026-09-24T00:10:00Z"));
+  });
+
+  it("the completion clock reads in the stored zone", () => {
+    expect(formatClockTime("2026-09-23T11:04:00Z", "Pacific/Auckland")).toBe("11:04 PM");
+    expect(formatClockTime("2026-09-23T11:04:00Z", "")).toBe("11:04 AM");
+  });
+
+  it("an invalid stored zone fails fast", () => {
+    expect(zoneOption("")).toBeUndefined();
+    expect(() => todayIn("Not/AZone", NOW)).toThrow(RangeError);
+  });
+});
+
+describe("empty zone keeps browser-local behavior", () => {
+  beforeAll(() => {
+    vi.stubEnv("TZ", "America/Los_Angeles");
+  });
+
+  afterAll(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it("matches the browser's own calendar and wall clock", () => {
+    // 13:00 UTC is 06:00 PDT on Sep 23.
+    expect(todayIn("", NOW)).toBe("2026-09-23");
+    expect(wallClockInstant("2026-09-23", 7, 30, "")).toBe(new Date(2026, 8, 23, 7, 30).getTime());
+    expect(formatClockTime("2026-09-23T14:04:00Z", "")).toBe("7:04 AM");
+  });
+});