import type { RecurrenceFrequency } from "../types";
/**
 * Parses an RRULE frequency token.
 */
export declare function parseFrequency(value: string | undefined): RecurrenceFrequency;
/**
 * Parses an RRULE interval token.
 */
export declare function parseInterval(value: string | undefined): number;
/**
 * Parses an RRULE count token.
 */
export declare function parseCount(value: string): number;
/**
 * Parses one RRULE BYDAY token.
 */
export declare function parseWeekday(value: string): number;
/**
 * Parses a comma-separated RRULE BYDAY list.
 */
export declare function parseWeekdayList(value: string): number[];
/**
 * Parses an RRULE UNTIL timestamp.
 */
export declare function parseUntilDate(value: string): Date;
/**
 * Formats a UTC date for RRULE DTSTART values.
 */
export declare function formatRRuleDate(date: Date): string;