/**
 * Provides pre-defined constants for common time durations in seconds.
 *
 */
declare enum InSeconds {
    /** One millisecond in seconds. */
    _1ms = 0.001,
    /** One microsecond in seconds. */
    _1us = 0.000001,
    /** One minute in seconds. */
    _1M = 60,
    /** Ten minutes in seconds. */
    _10M = 600,
    /** Tirty minutes in seconds. */
    _30M = 1800,
    /** One hour in seconds. */
    _1Hour = 3600,
    /** One day in seconds. */
    _1Day = 86400,
    /** One week in seconds. */
    _1Week = 604800,
    /** One month in seconds. */
    _1Month = 2592000,
    /** One year in seconds. */
    _1Year = 31536000
}
/**
 * Check if date is a valid date.
 *
 * @param	d The date to check.
 * @returns	True if date is a Date object, false otherwise.
 */
declare const isValidDate: (d: unknown) => d is Date;
/**
 * A compare function to use as the Array.prototype.sort() method.
 *
 * @param	date1	The oldest date to compare.
 * @param	date2	The newest date to compare.
 * @param	method	( Optional ) The sorting method. Default: 'DESC'.
 * 					- 'ASC' from oldest to newest.
 * 					- 'DESC' from newest to oldest.
 *
 * @see [Array.prototype.sort()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort)
 *
 * @returns The sorting result.
 */
declare const sortByDate: (date1: string | number | Date, date2: string | number | Date, method?: "ASC" | "DESC") => number;
/**
 * Get time difference in milliseconds between two dates.
 *
 * @param	futureDate	( Optional ) The date string | milliseconds since UNIX epoch time | Date object. Default: `new Date()`.
 * @param	olderDate	( Optional ) The older date string | milliseconds since UNIX epoch time | Date object. Default: `new Date()`.
 *
 * @returns	The difference between the future Date time and the older Date.
 */
declare const getTimeDiff: (futureDate?: string | number | Date, olderDate?: string | number | Date) => number;
/**
 * Combine Dates.
 *
 * By default it will perform an `add` operation.
 *
 * You can use a negative number as the Date time value in milliseconds since midnight, January 1, 1970 UTC
 * to perform a `subtraction` to the reference Date.
 *
 * @param	a The date string | milliseconds since UNIX epoch time | Date object. Default: `new Date()`.
 * @param	b ( Optional ) The reference date string | milliseconds since UNIX epoch time | Date object. Default: `new Date()`.
 *
 * @usage
 * ```ts
 * combineDates( 120 * 1000 )
 * // will add 2 minutes to the actual local date
 * combineDates( 120 * 1000, new Date( '01/01/2024 10:00' ) )
 * // will add 2 minutes to the given date instance
 * combineDates( 120 * 1000, '01/01/2024 10:00' )
 * // Mon Jan 01 2024 10:02:00 GMT+0100 (Ora standard dell’Europa centrale)
 * combineDates( -120 * 1000, '01/01/2024 10:00' )
 * // Mon Jan 01 2024 09:58:00 GMT+0100 (Ora standard dell’Europa centrale)
 * ```
 * @returns	The combined Date.
 */
declare const combineDates: (a: string | number | Date, b?: string | number | Date) => Date;

export { InSeconds, combineDates, getTimeDiff, isValidDate, sortByDate };