/**
 * @license
 * Copyright Google Inc. 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.
 *
 * Where:
 * - `value` is a Date, a number (milliseconds since UTC epoch) or an ISO string
 *   (https://www.w3.org/TR/NOTE-datetime).
 * - `format` indicates which date/time components to include. See {@link DatePipe} for more
 *   details.
 * - `locale` is a `string` defining the locale to use.
 * - `timezone` to be used for formatting. It understands UTC/GMT and the continental US time zone
 *   abbreviations, but for general use, use a time zone offset (e.g. `'+0430'`).
 *   If not specified, host system settings are used.
 *
 * See {@link DatePipe} for more details.
 */
export declare function formatDate(value: string | number | Date, format: string, locale: string, timezone?: string): string;
/**
 * 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;