export declare const convertDateStringToBigInt: (date: string | undefined, format: string) => bigint | undefined;
export declare const convertDateStringToNumber: (date: string | undefined, format: string) => number | undefined;
export declare const convertBigIntToDateString: (date: bigint | [bigint] | undefined, format: string) => string | undefined;
export declare const convertNumberToDateString: (date: number | undefined, format: string) => string | undefined;