/**
 * Checks if a given date is in the past.
 *
 * @example
 * isPast("2000-01-01") // true
 *
 * @param date The date to check.
 * @param includeTime Whether to include time in the comparison.
 * @returns True if the date is in the past.
 */
export declare function isPast(date: Date | string | number | null, includeTime?: boolean): boolean;