/**
 * Orthogonal to `time: true`. `date` is dd/MM/yyyy in every locale — one numeric order, so 09/10 never
 * reads two ways across a team; readable styles use word months in locale order. Not for a component's
 * internal chrome (calendar headers, axis labels), which uses `Intl` directly.
 */
export type DateFormatStyle = "date" | "medium" | "long" | "dayMonth" | "monthYear" | "quarterYear";
export interface FormatDateOptions {
    /** Default "date". */
    format?: DateFormatStyle;
    /** "14:30 <date>", with any `format`. Default false. */
    time?: boolean;
    /** Defaults to the home market, "vi-VN". */
    locale?: string;
    /** On the numeric `date` style. */
    compact?: boolean;
    /** Default "". */
    emptyLabel?: string;
    /**
     * The zone an instant (an ISO string naming its offset) is dated in. Offset-less values and
     * `Date`s are wall clocks and never move. Absent, the viewer's zone.
     */
    zone?: string;
}
export declare function isInstant(value: string): boolean;
/**
 * As `yyyy-MM-dd`: an instant on its day in `zone` (else the viewer's), a wall clock on its stated
 * day, reduced precision on its period's first day.
 */
export declare function calendarDay(value: Date | string | null | undefined, zone?: string): string | null;
/** Local midnight of today in `zone` (the viewer's if none), as `daysUntil` takes it. */
export declare function zonedToday(zone: string | undefined, now: Date): Date;
/** The moment `now` on `zone`'s wall clock (the viewer's if none), held as a local `Date` — what a stored
 *  wall clock ({@link zonedMoment}) is counted against, so a deadline at 14:00 falls at the workspace's
 *  14:00 wherever the viewer is. */
export declare function zonedNow(zone: string | undefined, now: Date): Date;
/** The moment a stored value names on `zone`'s wall clock, held as a local `Date`: a wall clock as
 *  written, an instant as `zone` reads it; `null` when unparseable. */
export declare function zonedMoment(value: string, zone: string | undefined): Date | null;
/** Period start for reduced precision; `null` when unparseable. Display is {@link formatDate}. */
export declare function parseDate(value: Date | string | null | undefined): Date | null;
/** "01/09 – 30/09/2026", the shared year printed once; an unrecorded end prints `none`. */
export declare function formatDateSpan(from: Date | string | null | undefined, to: Date | string | null | undefined, { locale, none }: {
    locale?: string;
    none: string;
}): string;
/**
 * Reduced precision is preserved: "YYYY-MM" or "YYYY" return verbatim, so a form round-trip never
 * fabricates a day. Full values reassemble as "yyyy-MM-dd".
 */
export declare function toISODate(value: Date | string | null | undefined): string;
/**
 * THE date formatter, sibling of `formatMoney`. `format`: `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 vi). `time: true` follows the day with its 24h time; `compact` drops
 * the numeric year. Never hand-roll a display date. Reduced precision renders only the parts it
 * has, ignoring `time`. Only an instant moves with `zone`.
 */
export declare function formatDate(value: Date | string | null | undefined, options?: FormatDateOptions): string;