49 lines
2.9 KiB
JavaScript
49 lines
2.9 KiB
JavaScript
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import test from "node:test";
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import assert from "node:assert/strict";
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import { BEIJING_TIMEZONE, formatBeijingDateTime, beijingDateKey, beijingDateTimeInput, parseBeijingDateTimeInput, beijingDateBoundary, beijingDayStart, beijingWeekStart, beijingCalendarRange } from "../src/lib/beijing-time.ts";
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test("Beijing display, date grouping and form round-trip ignore the browser timezone", () => {
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const previous = process.env.TZ;
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try {
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for (const zone of ["Etc/UTC", "America/Los_Angeles", "America/New_York", "Asia/Tokyo"]) {
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process.env.TZ = zone;
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const at = new Date("2026-10-05T12:16:08Z");
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assert.equal(BEIJING_TIMEZONE, "Asia/Shanghai");
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assert.match(formatBeijingDateTime(at), /20:16:08/);
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assert.equal(formatBeijingDateTime(at, { hour: "2-digit", minute: "2-digit", timeZone: zone }), "20:16");
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assert.equal(beijingDateKey("2026-10-04T16:30:00Z"), "2026-10-05");
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assert.equal(beijingDateTimeInput(at), "2026-10-05T20:16");
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assert.equal(parseBeijingDateTimeInput("2026-10-05T20:16"), "2026-10-05T12:16:00.000Z");
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assert.equal(parseBeijingDateTimeInput("2026-10-05T20:16:08.123"), "2026-10-05T12:16:08.123Z");
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assert.equal(beijingDayStart(at).toISOString(), "2026-10-04T16:00:00.000Z");
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assert.equal(beijingDateBoundary("2026-10-05", 1).toISOString(), "2026-10-05T16:00:00.000Z");
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assert.deepEqual(beijingCalendarRange(30, new Date("2026-10-05T16:30:00Z")), {
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from: "2026-09-06T16:00:00.000Z", to: "2026-10-05T16:30:00.000Z", timezone: "Asia/Shanghai",
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});
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}
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} finally {
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if (previous === undefined) delete process.env.TZ; else process.env.TZ = previous;
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}
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});
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test("Monday Beijing midnight resets the week, Tuesday midnight does not", () => {
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assert.equal(beijingWeekStart(new Date("2026-10-04T15:59:59Z")).toISOString(), "2026-09-27T16:00:00.000Z");
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assert.equal(beijingWeekStart(new Date("2026-10-04T16:00:00Z")).toISOString(), "2026-10-04T16:00:00.000Z");
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assert.equal(beijingWeekStart(new Date("2026-10-05T16:00:00Z")).toISOString(), "2026-10-04T16:00:00.000Z");
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assert.equal(beijingDateBoundary("2025-12-31", 1).toISOString(), "2025-12-31T16:00:00.000Z");
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assert.equal(beijingDateBoundary("2028-02-28", 1).toISOString(), "2028-02-28T16:00:00.000Z");
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});
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test("invalid dates do not become a shifted date or an invented valid time", () => {
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for (const value of [null, undefined, "", "not-a-date"]) {
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assert.equal(formatBeijingDateTime(value), "—");
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assert.equal(beijingDateKey(value), "");
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assert.equal(beijingDateTimeInput(value), "");
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}
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for (const value of ["2026-02-29T10:00", "2026-10-05T24:00", "2026-10-05T20:99", "2026-10-05T20:16:60", "2026-10-05", "2026-10-05T20:16Z"]) {
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assert.throws(() => parseBeijingDateTimeInput(value), RangeError);
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}
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assert.throws(() => beijingDateBoundary("2026-02-30"), RangeError);
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assert.throws(() => beijingCalendarRange(0), RangeError);
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});
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