/**
 * DateFormatter — Deterministic date formatting utilities.
 *
 * Fixes from CLI:
 * - Input validation on all methods (returns "Invalid date" for bad input)
 * - Removed formatRelativeEnhanced (near-duplicate of formatRelative)
 * - Removed formatSimple (non-deterministic locale)
 */
export declare class DateFormatter {
    /**
     * Format as relative time: "5 minutes ago", "3 hours ago", "2 days ago",
     * or absolute date if older than 7 days.
     */
    static formatRelative(isoString: string): string;
    /**
     * Format as absolute date: "Jul 31, 2025"
     */
    static formatDate(isoString: string): string;
    /**
     * Format as absolute date+time: "Jul 31, 2025, 10:17 AM"
     */
    static formatDateTime(isoString: string): string;
    /** Parse an ISO string into a Date, returning undefined for invalid input. */
    private static parse;
}
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