export declare function convertValue(value: Date | undefined): Date | undefined;
export declare function getSegmentLimits(date: Date, type: string, options: Intl.ResolvedDateTimeFormatOptions): {
    value?: undefined;
    minValue?: undefined;
    maxValue?: undefined;
} | {
    value: number;
    minValue: number;
    maxValue: number;
};
export declare function add(value: Date, part: string, amount: number, options: Intl.ResolvedDateTimeFormatOptions): Date | undefined;
export declare function cycleValue(value: number, amount: number, min: number, max: number, round?: boolean): number;
export declare function setSegment(value: Date, part: string, segmentValue: number, options: Intl.ResolvedDateTimeFormatOptions): Date | undefined;
export declare function parseNumber(str: string): number;
export declare function isNumeric(str: string): boolean;