/**
 * Get the last day of the month.
 *
 * @param {Date} date
 *
 * @return {Date}
 */
export declare function getMonthEnd(date: any): Date;
/**
 * Get the first day of the month.
 *
 * @param {Date} date
 *
 * @return {Date}
 */
export declare function getMonthStart(date: any): Date;
/**
 * Get the last day of the week.
 *
 * @param {Date} date
 *
 * @return {Date}
 */
export declare function getWeekEnd(date: any): Date;
/**
 * Return the week index of a date.
 *
 * @param {Date} date
 *
 * @return {number}
 */
export declare function getWeekIndex(date: any): number;
/**
 * Get the first day of the week.
 *
 * @param {Date} date
 *
 * @return {Date}
 */
export declare function getWeekStart(date: any): Date;
/**
 * Normalize to a javascript Date object.
 *
 * @param {Date|number|string} value
 *
 * @return {Date}
 */
export declare function normalizeDate(value: any): Date;
/**
 * Stringify a date.
 *
 * @param {Date} date
 *
 * @return {string}
 */
export declare function stringifyDate(date: any): string;