/**
 * The date STYLE — orthogonal to time (pass `time: true` to prepend a 24h time to any of these).
 * `date` reassembles dd/MM with a stable "/"; the readable styles use word months in locale order.
 * NOT for a component's own internal chrome — a calendar's header / weekday / a11y labels, a gantt
 * axis — which render their own internally-consistent label set with `Intl` directly.
 */
export type DateFormatStyle = "date" | "medium" | "long" | "dayMonth" | "monthYear" | "quarterYear";
export interface FormatDateOptions {
    /** The date style. Default "date". */
    format?: DateFormatStyle;
    /** Prepend the 24h time — "14:30 <date>". Composes with ANY `format`. Default false. */
    time?: boolean;
    /** BCP-47 locale. Defaults to the product's home market, "vi-VN". */
    locale?: string;
    /** Drop the year ("22/05") on the numeric `date` style. */
    compact?: boolean;
    /** Rendered for null / empty / unparseable input. Default "". */
    emptyLabel?: string;
}
/**
 * A Date or ISO value → a local wall-clock `Date` (period start for a reduced-precision value).
 * "" / null / unparseable → `null`. Use {@link formatDate} for display; this is for callers that
 * need the `Date` itself (a picker anchor, an axis position).
 */
export declare function parseDate(value: Date | string | null | undefined): Date | null;
/**
 * A Date or ISO value → the `DatePicker` / workflow date value. "" when empty.
 *
 * **Reduced precision is PRESERVED, not expanded.** A `date` field may carry "YYYY-MM" or "YYYY";
 * those are returned verbatim so a round-trip through a form never fabricates a day (writing back
 * "2026-05-01" for a value the user entered as "2026-05" would corrupt it). A full value (Date,
 * `yyyy-MM-dd`, or a datetime) reassembles as "yyyy-MM-dd".
 */
export declare function toISODate(value: Date | string | null | undefined): string;
/**
 * THE date-value formatter — the date sibling of `formatMoney`. Accepts a `Date` OR an ISO string
 * and returns a localized display string; defaults to the home market. `format` picks the date
 * style: `date` → `22/05/2026`; `medium` → `22 thg 5, 2026`; `long` → `22 tháng 5, 2026`;
 * `dayMonth` → `22 thg 5`, `monthYear` → `Tháng 5 năm 2026`, `quarterYear` → `Quý 2 năm 2026`
 * (`Q2 2026` outside Vietnamese). **`time: true` prepends the 24h time to
 * ANY style** — `14:30 22/05/2026`, `14:30 22 tháng 5, 2026` (time-first). `compact` drops the
 * year on the numeric `date` style. Never hand-roll a date with `padStart` / `getMonth` / a raw
 * `Intl.DateTimeFormat` for VALUE display — call this. (Component-internal chrome is exempt — see
 * {@link DateFormatStyle}.)
 *
 * **Reduced-precision values render only the parts they carry** — a month-year value shows
 * `05/2026` (numeric) / `thg 5, 2026` (readable), a bare year shows `2026`; no day is fabricated
 * and `time` is ignored (a calendar period has no clock).
 */
export declare function formatDate(value: Date | string | null | undefined, options?: FormatDateOptions): string;