/*! Copyright (c) 2018 Siemens AG. Licensed under the MIT License. */
/**
 * Returns a string in ISO 8601 format including timezone offset information.
 * @param date a Date object
 * @param includeMillis whether to include milliseconds in the string (defaults to false)
 */
export declare function toLocalIsoString(date: Date, includeMillis?: boolean): string;
/**
 * Returns a string in ISO 8601 format for a duration.
 * @param duration a duration given in milliseconds
 */
export declare function toDurationIsoString(duration: number): string;
/**
 * Defines a time interval using the number of milliseconds since the epoc in UTC
 * instead of ISO 8601 standard time intervals. This is used for consistency within
 * the system.
 *
 * An interval can have four formats:
 * - start and end timestamps
 * - start timestamp and duration
 * - duration and end timestamp
 * - duration only
 *
 * The ISO 8601 standard string can be created using the function `toLocalTimeIntervalIsoString`
 * in the `@coaty/core` module.
 */
export interface TimeInterval {
    /**
     * Start timestamp of the interval.
     * Value represents the number of milliseconds since the epoc in UTC.
     * (see Date.getTime(), Date.now())
     *
     * This can be either used with end timestamp or a duration but not both.
     */
    start?: number;
    /**
     * End timestamp of the interval.
     * Value represents the number of milliseconds since the epoc in UTC.
     * (see Date.getTime(), Date.now())
     *
     * This can be either used with start timestamp or a duration but not both.
     */
    end?: number;
    /**
     * Duration of the interval. Value represents the number of milliseconds.
     *
     * This can be either used with start or end timestamp but not both.
     */
    duration?: number;
}
export declare function isTimeInterval(obj: any): boolean;
/**
 * Returns whether the given time interval object is valid.
 */
export declare function isValidTimeInterval(interval: TimeInterval): boolean;
/**
 * Returns a string in ISO 8601 format for a time interval including timezone offset information.
 * @param interval a TimeInterval object
 * @param includeMillis whether to include milliseconds in the string (defaults to false)
 */
export declare function toLocalIntervalIsoString(interval: TimeInterval, includeMillis?: boolean): string;