/**
 * 时间前补零
 */
export declare const pad: (n: number, maxLength?: number) => string;
/**
 * 格式化时间为字符串，入参month为自然语义月，从1开始
 * 如果不需要年月日时，自动补全年月日到1970-1-1
 */
export declare const dateTimeNumberToString: ({ year, month, date, hour, minute, second }: Partial<Record<"year" | "month" | "date" | "hour" | "minute" | "second", number | null>>, { format, timeOnly, }: {
    /**
     * dayjs支持的format
     * @example YYYY-MM-DD HH:mm:ss
     */
    format: string;
    /**
     * 是否需要年月日信息
     */
    timeOnly?: boolean;
}) => string | undefined;
/**
 * 解析时间字符串为自然语义数字，month从1开始，自动处理超边界
 */
export declare function stringToDateTimeNumber(str: string | null | undefined, options?: {
    timeOnly: true;
}): Record<'hour' | 'minute' | 'second', number | null> | undefined;
export declare function stringToDateTimeNumber(str: string | null | undefined, options?: {
    timeOnly?: false | undefined;
}): Record<'year' | 'month' | 'date' | 'hour' | 'minute' | 'second', number | null> | undefined;