import { CalendarDateTime } from '@internationalized/date';
import type { DateValue } from '@internationalized/date';
/**
 * A wall-clock date and time as `YYYY-MM-DDTHH:MM` or `YYYY-MM-DDTHH:MM:SS`.
 *
 * An alias for `string`, so it documents rather than enforces;
 * `toCalendarDateTime` is the runtime check.
 */
export type IsoDateTime = string;
/**
 * ISO string in, `CalendarDateTime` out. Throws on anything else — a `Date`,
 * a timestamp, an offset or a zone — for the reason `toCalendarDate` does: an
 * empty field for a malformed value looks exactly like "nothing chosen".
 */
export declare function toCalendarDateTime(value: IsoDateTime | null | undefined, prop: string): CalendarDateTime | null;
/**
 * A date-time out, ISO string back, projected to Gregorian — see `toIso` for
 * why the parts are assembled rather than `toString()`ed.
 */
export declare function toIsoDateTime(value: DateValue & {
    hour?: number;
    minute?: number;
    second?: number;
}, withSeconds: boolean): IsoDateTime;
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