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Logical API errors throw stable codes so users see translated messages instead of a generic bad request. Co-authored-by: Cursor <cursoragent@cursor.com>
56 lines
1.4 KiB
TypeScript
56 lines
1.4 KiB
TypeScript
/** Convert an absolute instant into weekday + minute-of-day in an IANA time zone. */
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const JS_WEEKDAY: Record<string, number> = {
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Sun: 0,
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Mon: 1,
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Tue: 2,
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Wed: 3,
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Thu: 4,
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Fri: 5,
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Sat: 6,
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};
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export function isValidIanaTimeZone(timeZone: string): boolean {
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if (!timeZone || timeZone.length > 64) {
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return false;
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}
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try {
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Intl.DateTimeFormat('en-US', { timeZone }).format(new Date(0));
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return true;
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} catch {
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return false;
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}
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}
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export function zonedWeekdayAndMinutes(
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date: Date,
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timeZone: string,
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): { jsWeekday: number; minuteOfDay: number } {
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const parts = new Intl.DateTimeFormat('en-US', {
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timeZone,
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weekday: 'short',
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hour: '2-digit',
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minute: '2-digit',
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hourCycle: 'h23',
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}).formatToParts(date);
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const weekdayToken = parts.find((p) => p.type === 'weekday')?.value ?? 'Sun';
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let hour = Number(parts.find((p) => p.type === 'hour')?.value ?? '0');
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const minute = Number(parts.find((p) => p.type === 'minute')?.value ?? '0');
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if (hour === 24) {
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hour = 0;
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}
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return {
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jsWeekday: JS_WEEKDAY[weekdayToken] ?? 0,
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minuteOfDay: hour * 60 + minute,
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};
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}
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/** Weekday of a YYYY-MM-DD civil date (Gregorian; same worldwide). */
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export function civilDateJsWeekday(isoDate: string): number {
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const [y, m, d] = isoDate.split('-').map(Number);
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const utcNoon = new Date(Date.UTC(y, m - 1, d, 12, 0, 0, 0));
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return utcNoon.getUTCDay();
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}
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