export type DatePickerFormat = "date" | "datetime" | "date_range" | "datetime_range";
export interface DateParts {
    y: number;
    mo: number;
    d: number;
    h: number;
    mi: number;
}
export declare function isRangeFormat(format: DatePickerFormat): boolean;
export declare function hasTimeFormat(format: DatePickerFormat): boolean;
export declare const pad: (n: number) => string;
export declare function parsePart(input: string): DateParts | null;
export declare function partsToIso(p: DateParts, hasTime: boolean): string;
export declare function isoToDate(iso: string): Date | null;
export declare function dateToParts(d: Date): DateParts;
/** "" when blank, null when unparseable. */
export declare function parseText(text: string, hasTime: boolean): string | null;
export declare function timeText(iso: string): string;
export declare function splitTime(time: string): {
    h: number;
    mi: number;
};
export declare function withCalendarDate(date: Date, prevIso: string, hasTime: boolean): string;
/** Today if none. */
export declare function withTimeOfDay(prevIso: string, time: string): string;
export declare function nowIso(hasTime: boolean): string;
export declare function isoHasTime(iso: string | null | undefined): boolean;
/** Empty when unparseable. */
export declare function dropTime(iso: string): string;
export type DateCommit = {
    kind: "save";
    value: string;
} | {
    kind: "clear";
} | {
    kind: "none";
} | {
    kind: "invalid";
};
/**
 * `draft` is the last complete value ("" when emptied); `incomplete` flags a partial entry, which
 * never commits or wipes the stored value. An emptied draft clears only when `clearable`, else
 * reverts.
 */
export declare function resolveDateCommit(opts: {
    draft: string;
    value: string | null;
    incomplete: boolean;
    clearable: boolean;
}): DateCommit;
/** Null when not a valid time. */
export declare function parseTimeString(input: string): string | null;