/**
 * Normalize formatted date/time strings for stable comparisons.
 *
 * - Removes Unicode format and bidi control characters (LRM/RLM/LRE/RLE/etc.)
 * - Removes zero-width space and BOM
 * - Normalizes various non-breaking and narrow spaces to plain space
 * - Collapses repeated whitespace to a single space and trims
 * - Normalizes common dash/minus characters to ASCII hyphen-minus
 * - Optionally lowercases the result (disabled by default)
 */
export declare function normalizeDateTime(input: string, opts?: {
    lower?: boolean;
    locale?: string;
}): string;