export type PossibleDate = Date | string | number | null | undefined;
export declare const CURRENT_YEAR: number;
export declare function isDate(value: string): boolean;
export declare function isModifiedDate(value: string): boolean;
/**
 * Converts a formatted date string, time number, or Date object to a Date object
 *
 * @param input - A date represented as string or number, or a Date object
 * @returns - A Date object or null if the input is not a valid date
 */
export declare function toDate(input: PossibleDate): Date | null;
/**
 * Returns a formatted date string in the user's locale
 *
 * @param input - A date represented as string or number, or a Date object
 * @param locale - The user's locale (default is navigator.languages)
 * @returns - A Intl formatted date time string
 */
export declare function getDateForLocale(input: PossibleDate, locale?: readonly string[]): string;
/**
 * Returns a formatted time string in the user's locale
 *
 * @param input - A date represented as string or number, or a Date object
 * @param locale - The user's locale (default is navigator.languages)
 * @returns - A Intl formatted time string
 */
export declare function getTimeForLocale(input: PossibleDate, locale?: readonly string[]): string;
/**
 * Returns a formatted date time string in the user's locale
 *
 * @param input - A date represented as string or number, or a Date object
 * @param locale - The user's locale (default is navigator.languages)
 * @returns - A formatted date time string or empty string if the input is not a valid date
 */
export declare function getDateTimeForLocale(input: PossibleDate, locale?: readonly string[]): string;
/**
 * Returns a formatted date string in 'YYYY-MM-DD' format
 *
 * @param input - A date represented as string or number, or a Date object
 * @returns - A formatted date string or empty string if the input is not a valid date
 */
export declare function toDateString(input: PossibleDate): string;
/**
 * Returns a formatted time string in 'HH:MM' format
 *
 * @param input - A date represented as string or number, or a Date object
 * @returns - A formatted time string or empty string if the input is not a valid date
 */
export declare function toTimeString(input: PossibleDate): string;
/**
 * Returns a formatted date+time string in 'YYYY-MM-DD HH:MM' format
 *
 * @param input - A date represented as string or number, or a Date object
 * @returns - A formatted date time string or empty string if the input is not a valid date
 */
export declare function toDateTimeString(input: PossibleDate): string;
export declare function toRelativeDate(date: string): string;
export declare function sameDate(firstDate: Date, secondDate: Date): boolean;
export declare function toWordyDate(date: Date): string;
export declare function toFormatDateTime(possibleDate: PossibleDate, useTodayString?: boolean): string;