/**
 * The calendar date a KYC form carries, between the wire and a date picker.
 *
 * - The wire value is a **zoneless day**: `YYYY-MM-DD`, the day the user
 *   tapped, identical from every timezone. The server reads it as a UTC day
 *   (`new Date(value + 'T00:00:00Z')`), and so does `validateForm`.
 * - `Date` objects here are local midnight of that day, never a conversion of
 *   it: `new Date('1990-12-10')` is UTC midnight, which is the 9th behind UTC,
 *   so the picker would open and save a day early.
 * - "Today" is therefore the **UTC** day — the clock the not-future rule is
 *   judged on — so a user ahead of UTC cannot pick a day the server refuses.
 */
/** The wire format, read off a `Date` the picker handed back. */
export declare function toCalendarDate(date: Date): string;
/**
 * The date a stored answer names, or `undefined` when it names none.
 *
 * The round trip is what rejects `2026-02-30`: `Date` rolls an impossible day
 * forward into the next month rather than refusing it.
 */
export declare function parseCalendarDate(value: string): Date | undefined;
/**
 * The answer as the user's own locale writes it, or the answer itself when
 * that cannot be formatted — an unformatted date still reads as the date.
 */
export declare function formatCalendarDate(value: string, locale: string): string;
/**
 * The bounds the picker offers.
 *
 * - A birth date in the future is never right, and the provider answers one
 *   with an empty 400 the user reads as an SDK failure.
 * - The ceiling is the **UTC** day, because that is the clock the server's
 *   not-future rule is judged on. Anyone ahead of UTC would otherwise be
 *   offered a day their own submission comes back refused for.
 */
export declare function birthDateRange(now?: Date): {
    minimumDate: Date;
    maximumDate: Date;
};
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