/**
 * Parses a string representing a timestamp using the given format into a `Date` object.
 * @param {string} string The date-time string to be parsed
 * @param {string} format The format against which to parse the date-time string
 * @param {Date | null} [defaultValue] If the string cannot be properly parsed against the format string, this is returned
 * @returns {Date | null} The date object representing the given string
 */
export function parseDateTime(string: string, format: string, defaultValue?: Date | null | undefined): Date | null;
/**
 * Formats a given `Date` object into a string representation.
 * @param {Date | null} datetime The timestamp to be formatted
 * @param {string} format The format to which the given timestamp will be formatted
 */
export function formatDateTime(datetime: Date | null, format: string): string | null;
/**
 * Generates an array with the names of the days of the week for the given locale.
 * @param {string | string[] | undefined} locale The locale(s) in which the day names should be output. Pass an empty array to use the default locale. Read more on the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl#locales_argument)
 * @param {0 | 1 | 2 | 3 | 4 | 5 | 6} firstWeekday First day of the week. 1 = Monday.
 * @returns {[string, string, string, string, string, string, string]}
 */
export function getWeekdays(locale: string | string[] | undefined, firstWeekday: 0 | 1 | 2 | 3 | 4 | 5 | 6): [string, string, string, string, string, string, string];
/**
 * Check if the given object is a date.
 * @param {*} date The object to check
 * @returns {date is Date} `true` if the given object is a valid `Date`, `false` otherwise
 */
export function isDate(date: any): date is Date;
/**
 * Check for equality between 2 `Date` objects, disregarding the time.
 * @param {Date | null} date1
 * @param {Date | null} date2
 * @returns {boolean}
 */
export function datesEqual(date1: Date | null, date2: Date | null): boolean;
/**
 * Check for equality between 2 `Date` objects, including the time (hours, minutes, and seconds only).
 * @param {Date | null} date1
 * @param {Date | null} date2
 * @returns {boolean}
 */
export function dateTimesEqual(dt1: any, dt2: any): boolean;
/**
 * Checks if the date of the first `Date` object came before the date of the second (disregards time).
 * @param {Date | null} date1
 * @param {Date | null} date2
 * @returns {boolean}
 */
export function datesLessEqual(date1: Date | null, date2: Date | null): boolean;
/**
 * Checks if the date is included in the given array of dates or ranges.
 * @param {Date} date The date object whose inclusion is to be checked
 * @param {Array<Date | { start?: Date; end?: Date; }>} dateRanges The set of dates
 * @returns {boolean}
 */
export function dateIncluded(date: Date, dateRanges: Array<Date | {
    start?: Date;
    end?: Date;
}>): boolean;
/**
 * Generates a calendar view of a given month.
 * @param {0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11} month Zero-based numeric value for month. 0 = January
 * @param {number} year
 * @param {0 | 1 | 2 | 3 | 4 | 5 | 6} firstWeekday First day of the week. 1 = Monday
 * @param {Array<Date | {start?: Date; end?: Date}>} disabledDates
 * @returns {Array<Array<{ value: Date; outside: boolean; disabled: boolean }>>}
 */
export function getCalendar(month: 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11, year: number, firstWeekday: 0 | 1 | 2 | 3 | 4 | 5 | 6, disabledDates?: Array<Date | {
    start?: Date;
    end?: Date;
}>): Array<Array<{
    value: Date;
    outside: boolean;
    disabled: boolean;
}>>;
/**
 * Copies the date (day, month, and year) from the first `Date` object to the second.
 * @template {Date | null} T1
 * @template {Date | null} T2
 * @param {T1} source The object to copy the date from
 * @param {T2} destination The object to which the date will be copied, modified in-place
 * @returns {T1 extends null ? T1 : T2 extends null ? T1 : T2} The modified object
 */
export function applyDate<T1 extends Date | null, T2 extends Date | null>(source: T1, destination: T2): T1 extends null ? T1 : T2 extends null ? T1 : T2;
/**
 * Copies the time (hour, minute, and second) from the first `Date` object to the second.
 * @template {Date | null} T1
 * @template {Date | null} T2
 * @param {T1} source The object to copy the time from
 * @param {T2} destination The object to which the time will be copied, modified in-place
 * @returns {T1 extends null ? T1 : T2 extends null ? T1 : T2} The modified object
 */
export function applyTime<T1 extends Date | null, T2 extends Date | null>(source: T1, destination: T2): T1 extends null ? T1 : T2 extends null ? T1 : T2;
/**
 * Copy a Date object, respecting null values.
 * @template {Date | null} T
 * @param {T} date The object from which a copy should be made
 * @returns {T} The clone of the given object
 */
export function copyDate<T extends Date | null>(date: T): T;
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