import { DateTime } from 'luxon';
import { Time } from '../timetable/time.js';
export type GtfsDate = number;
export type GtfsTime = string;
export declare const toGtfsDate: (date: DateTime) => GtfsDate;
/**
 * Converts a time string in the format 'HH:mm:ss' to a Time object
 * (number of seconds since midnight).
 *
 * This method splits the input time string into hours, minutes, and seconds,
 * and then calculates the total number of seconds.
 *
 * @param time - A string representing the time in 'HH:mm:ss' format.
 * @returns The GTFS time as the number of seconds since midnight.
 * @throws An error if the input time string is not in the correct format.
 */
export declare const toTime: (time: GtfsTime) => Time;