declare type MiliSeconds = number;
export declare const K_BYTE = 1024;
export declare const M_BYTE: number;
export declare function sizeOf(str: string): number;
export declare function isValidDay(day: string): boolean;
export declare function dateFormat2Day(date: Date): string;
export declare function getStartOfDay(date: Date): MiliSeconds;
export declare function dayFormat2Date(day: string): Date;
export declare const ONE_DAY_TIME_SPAN: number;
export declare function timestampToDateTime(timestamp?: number, format?: string): string;
export {};