import { DateMode, FieldDescriptor } from './types.js';
/** ISO day -> local Date at midnight, or null when malformed / not a real day. */
export declare function parseIsoDate(iso: unknown): Date | null;
export declare function formatIsoDate(date: Date): string;
/** ISO local datetime ('2026-04-13T14:30', seconds optional) -> local Date, or null. */
export declare function parseIsoDateTime(iso: unknown): Date | null;
/** Local Date -> ISO local datetime, minute precision (no seconds, no offset). */
export declare function formatIsoDateTime(date: Date): string;
export declare const dateModeOf: (field: FieldDescriptor) => DateMode;
/**
 * Every ISO day a date value holds, whatever the mode: a single string, a
 * `[start, end]` range (both ends only — the interior is implied) or a list.
 * Non-string entries are dropped; shape errors are the validator's job.
 */
export declare function isoDaysOf(value: unknown): string[];
/**
 * One `disabled_dates` entry: an ISO day or an inclusive ISO interval
 * `start/end`. Returns `[from, to]` (from === to for a single day) or null.
 */
export declare function parseDisabledEntry(entry: string): [Date, Date] | null;
/**
 * True when `iso` falls on a disabled weekday or inside a disabled date /
 * interval of the descriptor. Malformed entries never disable anything.
 * `disabled_dates` / `disabled_weekdays` are calendar-day rules, so an ISO
 * datetime (`enable_time` fields) is checked on its date part only.
 */
export declare function isDateDisabled(field: FieldDescriptor, iso: string): boolean;
/**
 * Days between a range's ends (inclusive) that a picker would step over —
 * so a range can be rejected when a holiday sits INSIDE it. Capped so a
 * hostile `["1900-01-01","2999-12-31"]` submission cannot spin the server;
 * beyond the cap only the ends are checked.
 */
export declare function rangeInteriorDays(start: string, end: string, cap?: number): string[];