export declare function isEqual(dateA: Date, dateB: Date): boolean;
export declare function getDaysInMonth(year: number, monthIndex: number): number;
export declare function isValid(date: unknown): date is Date;
/**
 * Simple date parse function. Only support simple format like yyyy-mm-dd or dd/mm/yyyy
 * @param {String} inputStr input string to parse
 * @param {String} format simple date format
 */
export declare function parse(inputStr: string, format: string): Date;
/**
 * Simple date format function. Only support simple format like yyyy-mm-dd.
 * @param {Date} date date to format
 * @param {String} formatStr simple date format
 */
export declare function format(date: Date, formatStr: string): string;
/**
 * parse simple date format to regexp string.
 * @param {String} formatStr format string
 * @returns {String}
 */
export declare function formatToReStr(formatStr: string): string;