/**
 * for form YYYY-MM-DD
 */
declare function toString(date: Date): string;
declare function toDate(str: string): Date | undefined;
declare function makeSDate(date: Date): Date;
declare function makeEDate(date: Date): Date;
declare function eq(d1: Date, d2: Date): boolean;
declare function g(d1: Date, d2: Date): boolean;
declare function ge(d1: Date, d2: Date): boolean;
declare function l(d1: Date, d2: Date): boolean;
declare function le(d1: Date, d2: Date): boolean;
declare function b(s: Date, d: Date, e: Date): boolean;
declare function be(s: Date, d: Date, e: Date): boolean;
/**
 * dateF : date functions
 */
export declare const dateF: {
    toString: typeof toString;
    toDate: typeof toDate;
    makeSDate: typeof makeSDate;
    makeEDate: typeof makeEDate;
    '===': typeof eq;
    '>': typeof g;
    '>=': typeof ge;
    '<': typeof l;
    '<=': typeof le;
    's<d<e|e<d<s': typeof b;
    's<=d<=e|e<=d<=s': typeof be;
    eq: typeof eq;
    g: typeof g;
    ge: typeof ge;
    l: typeof l;
    le: typeof le;
    b: typeof b;
    be: typeof be;
};
export {};
