196e10eacc
The container runs on UTC and the school does not: at 00:30 in Erfurt the process clock still says yesterday, so anything deriving "today" from a Date would prepare the wrong school day twice a night. core/dates.ts holds calendar dates as plain YYYY-MM-DD strings, which is what a school day is — today in Europe/Berlin, whole-day arithmetic anchored at noon UTC so no daylight-saving change can shift a date, the German weekday and day formats, and the compact form the timetable API takes. isCalendarDate round-trips rather than only matching a shape: Date.parse turns 2026-02-30 into March 2nd instead of refusing it, so a shape check alone would let a caller read a different day than it asked for. germanDate moves here from mcp/prompts.ts, its only previous home, so the timezone is stated in one place. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
67 lines
2.3 KiB
TypeScript
67 lines
2.3 KiB
TypeScript
import assert from 'node:assert/strict';
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import { describe, it } from 'node:test';
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import {
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addDays,
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compactDate,
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daysBetween,
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germanDate,
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germanDay,
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germanWeekday,
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isCalendarDate,
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schoolToday,
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} from '../src/core/dates.ts';
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describe('schoolToday', () => {
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it('is the school\'s date, not the container\'s', () => {
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// 23:30 UTC in January is already tomorrow in Berlin (UTC+1) — the case
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// that would make a nightly briefing prepare the wrong day.
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assert.equal(schoolToday(new Date('2026-01-15T23:30:00Z')), '2026-01-16');
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// And in summer the offset is two hours.
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assert.equal(schoolToday(new Date('2026-07-15T22:30:00Z')), '2026-07-16');
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assert.equal(schoolToday(new Date('2026-07-15T21:30:00Z')), '2026-07-15');
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});
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});
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describe('addDays and daysBetween', () => {
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it('walks calendar dates across a daylight-saving change', () => {
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// Clocks go forward in the EU on 2026-03-29, so a day of 23 hours lies
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// inside this range.
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assert.equal(addDays('2026-03-28', 2), '2026-03-30');
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assert.equal(daysBetween('2026-03-28', '2026-03-30'), 2);
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// And back again in October.
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assert.equal(addDays('2026-10-24', 2), '2026-10-26');
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});
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it('crosses months and years', () => {
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assert.equal(addDays('2026-12-31', 1), '2027-01-01');
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assert.equal(addDays('2026-01-01', -1), '2025-12-31');
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assert.equal(addDays('2028-02-28', 1), '2028-02-29');
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assert.equal(daysBetween('2026-09-21', '2026-09-18'), -3);
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});
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it('refuses something that is not a calendar date', () => {
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assert.throws(() => addDays('21.09.2026', 1), /YYYY-MM-DD/);
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});
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});
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describe('calendar date helpers', () => {
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it('recognises real dates only', () => {
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assert.equal(isCalendarDate('2026-09-21'), true);
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assert.equal(isCalendarDate('2026-13-01'), false);
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assert.equal(isCalendarDate('2026-02-30'), false);
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assert.equal(isCalendarDate('2026-9-21'), false);
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assert.equal(isCalendarDate('heute'), false);
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});
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it('formats the way a German timetable reads', () => {
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assert.equal(germanWeekday('2026-09-21'), 'Montag');
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assert.equal(germanWeekday('2026-09-17'), 'Donnerstag');
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assert.equal(germanDay('2026-09-21'), '21.09.2026');
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assert.equal(compactDate('2026-09-21'), 20_260_921);
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});
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it('gives a moment the school\'s day, with its weekday', () => {
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assert.equal(germanDate(new Date('2026-09-14T23:30:00Z')), 'Dienstag, 15.09.2026');
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});
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});
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