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/**
* The {@link formatRFC3339} function options.
*/
export interface FormatRFC3339Options {
/** The number of digits after the decimal point after seconds, defaults to 0 */
fractionDigits?: 0 | 1 | 2 | 3;
}
/**
* @name formatRFC3339
* @category Common Helpers
* @summary Format the date according to the RFC 3339 standard (https://tools.ietf.org/html/rfc3339#section-5.6).
*
* @description
* Return the formatted date string in RFC 3339 format. Options may be passed to control the parts and notations of the date.
*
* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
*
* @param date - The original date
* @param options - An object with options.
*
* @returns The formatted date string
*
* @throws `date` must not be Invalid Date
*
* @example
* // Represent 18 September 2019 in RFC 3339 format:
* formatRFC3339(new Date(2019, 8, 18, 19, 0, 52))
* //=> '2019-09-18T19:00:52Z'
*
* @example
* // Represent 18 September 2019 in RFC 3339 format, 3 digits of second fraction
* formatRFC3339(new Date(2019, 8, 18, 19, 0, 52, 234), {
* fractionDigits: 3
* })
* //=> '2019-09-18T19:00:52.234Z'
*/
export declare function formatRFC3339<DateType extends Date>(
date: DateType | number | string,
options?: FormatRFC3339Options,
): string;