/**
 * Format a date as relative time for table cells.
 *
 * Granularity (from the Date & timestamp display guide):
 * - 0–59 sec → "Just now"
 * - 1–59 min → "{n} min ago"
 * - 1–23 h → "{n} hours ago" / "1 hour ago"
 * - 24–47 h → "Yesterday, {HH:mm}"
 * - 2–6 days → "{n} days ago"
 * - 7–13 days → "1 week ago"
 * - 14–27 days → "{n} weeks ago"
 * - 28–149 days → "{n} months ago"
 * - 150 days – 11 months → "{d} {MMM}"
 * - ≥ 12 months → "{d} {MMM}, {yyyy}"
 *
 * Future dates are treated as "Just now" (clock skew tolerance).
 */
export declare const formatRelativeTime: (date: Date, now?: Date) => string;
/**
 * Format a date as absolute time for tooltips.
 *
 * Output: "11 Feb, 2026 14:32:07 GMT+2"
 */
export declare const formatAbsoluteTime: (date: Date, options?: {
    showSeconds?: boolean;
}) => string;
/**
 * Format a date as short absolute date for cells.
 *
 * Output: "11 Feb, 2026"
 */
export declare const formatAbsoluteDate: (date: Date, now?: Date) => string;
/**
 * Format only the time portion for cells.
 *
 * Output: "14:32 GMT+2"
 */
export declare const formatTimeOnly: (date: Date) => string;
/**
 * Format timezone as "GMT+N" or "UTC".
 */
export declare const formatTimezone: (date: Date) => string;