/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
export declare const ISO8601_DATE_REGEX: RegExp;
/**
 * @ngModule CommonModule
 * @description
 *
 * Formats a date according to locale rules.
 *
 * @param value The date to format, as a Date, or a number (milliseconds since UTC epoch)
 * or an [ISO date-time string](https://www.w3.org/TR/NOTE-datetime).
 * @param format The date-time components to include. See `DatePipe` for details.
 * @param locale A locale code for the locale format rules to use.
 * @param timezone The time zone. A time zone offset from GMT (such as `'+0430'`),
 * or a standard UTC/GMT or continental US time zone abbreviation.
 * If not specified, uses host system settings.
 *
 * @returns The formatted date string.
 *
 * @see {@link DatePipe}
 * @see [Internationalization (i18n) Guide](/guide/i18n-overview)
 *
 * @publicApi
 */
export declare function formatDate(value: string | number | Date, format: string, locale: string, timezone?: string): string;
/**
 *  ISO Week starts on day 1 (Monday) and ends with day 0 (Sunday)
 */
export declare function getThursdayThisIsoWeek(datetime: Date): Date;
/**
 * Converts a value to date.
 *
 * Supported input formats:
 * - `Date`
 * - number: timestamp
 * - string: numeric (e.g. "1234"), ISO and date strings in a format supported by
 *   [Date.parse()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse).
 *   Note: ISO strings without time return a date without timeoffset.
 *
 * Throws if unable to convert to a date.
 */
export declare function toDate(value: string | number | Date): Date;
/**
 * Converts a date in ISO8601 to a Date.
 * Used instead of `Date.parse` because of browser discrepancies.
 */
export declare function isoStringToDate(match: RegExpMatchArray): Date;
export declare function isDate(value: any): value is Date;