/**
 * Rounds a date off to seconds.
 *
 * @param date -
 * @param withMilliseconds - If true, YYYY-MM-DDThh:mm:ss.fffffffZ will be returned;
 *                                          If false, YYYY-MM-DDThh:mm:ssZ will be returned.
 * @returns Date string in ISO8061 format, with or without 7 milliseconds component
 */
export declare function truncatedISO8061Date(date: Date, withMilliseconds?: boolean): string;
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