/**
 * Formats a Date object or a date string into an ISO 8601 UTC string.
 * Example: 2025-05-16T15:30:00.123Z
 * @param date The Date object or a string that can be parsed into a Date.
 * @returns ISO 8601 UTC string.
 */
export declare function formatToISO8601UTC(date: Date | string | number): string;
/**
 * Gets the current time as an ISO 8601 UTC string.
 * @returns Current time in ISO 8601 UTC string format.
 */
export declare function getCurrentISO8601UTC(): string;
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