Function validateDateRange

packages/web/src/features/git/dateUtils.ts:110–134

(since: string | undefined, until: string | undefined)

 * @returns Error message if invalid, null if valid
 */
export function validateDateRange(since: string | undefined, until: string | undefined): string | null {
    if (!since || !until) {
        return null; // No validation needed if either is missing
    }

    const parsedSince = parseTemporalDate(since);
    const parsedUntil = parseTemporalDate(until);

    if (!parsedSince || !parsedUntil) {
        return null; // Let individual date parsing handle invalid formats
    }

    const sinceDate = new Date(parsedSince);
    const untilDate = new Date(parsedUntil);

    if (isNaN(sinceDate.getTime()) || isNaN(untilDate.getTime())) {
        return null;
    }

    if (sinceDate > untilDate) {
        return `Invalid date range: 'since' (${since}) must be before 'until' (${until})`;
    }

    return null;
}

/**
 * Convert a date to a format suitable for Prisma database queries.