josh
a87f97ef53
new Date().toISOString() returns UTC, causing the calendar to advance to the next day at 8pm EDT / 7pm EST. getTodayLocal() reads local wall-clock time and rolls back one day before 3am so the calendar stays on the current day through the night. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
36 lines
1.3 KiB
TypeScript
36 lines
1.3 KiB
TypeScript
/**
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* Environment variable helpers.
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*/
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/**
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* Parse a staleness window from an env var string (interpreted as hours).
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* Falls back to `defaultHours` when the value is missing, non-numeric,
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* non-finite, or <= 0 — preventing NaN from silently breaking staleness checks.
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*/
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export function parseStalenessHours(envVar: string | undefined, defaultHours: number): number {
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const parsed = parseInt(envVar ?? "", 10);
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return Number.isFinite(parsed) && parsed > 0 ? parsed : defaultHours;
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}
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/**
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* Returns today's date as YYYY-MM-DD using local wall-clock time with a 3 AM
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* switchover. Before 3 AM local time we still consider it "yesterday", so the
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* calendar doesn't flip to the next day at midnight while people are still out
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* at the park.
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*
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* Important: `new Date().toISOString()` returns UTC, which causes the date to
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* advance at 8 PM EDT (UTC-4) or 7 PM EST (UTC-5) — too early. This helper
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* corrects that by using local year/month/day components and rolling back one
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* day when the local hour is before 3.
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*/
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export function getTodayLocal(): string {
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const now = new Date();
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if (now.getHours() < 3) {
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now.setDate(now.getDate() - 1);
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}
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const y = now.getFullYear();
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const m = String(now.getMonth() + 1).padStart(2, "0");
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const d = String(now.getDate()).padStart(2, "0");
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return `${y}-${m}-${d}`;
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}
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