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Keep school dates in the school's timezone

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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>
This commit is contained in:
MechaCat02
2026-09-17 20:43:24 +02:00
parent ab581aa5ca
commit 196e10eacc
4 changed files with 157 additions and 12 deletions
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4
test/prompts.test.ts
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@@ -1,7 +1,8 @@
import assert from 'node:assert/strict';
import { describe, it } from 'node:test';
import { ErrorCode } from '@modelcontextprotocol/sdk/types.js';
import { argumentText, examPrompt, germanDate, resolveTarget, summaryPrompt, type Target } from '../src/mcp/prompts.ts';
import { germanDate } from '../src/core/dates.ts';
import { argumentText, examPrompt, resolveTarget, summaryPrompt, type Target } from '../src/mcp/prompts.ts';
import { ProtocolError } from '../src/mcp/tools/result.ts';
const CANDIDATES: Target[] = [
@@ -151,3 +152,4 @@ describe('germanDate', () => {
assert.equal(germanDate(new Date('2026-09-14T23:30:00Z')), 'Dienstag, 15.09.2026');
});
});