/**
 * Date time stamp and formatting
 *
 * @export
 * @param {(number | string | undefined)} date
 * @param {string} [format] defaults  'YYYY-MM-DD hh:mi:ss.SSS'
 * @param {number} [offset] defaults  8
 * @returns {(number | string)}
 */
export declare function dateTime(date?: number | string | undefined, format?: string, offset?: number): number | string;