export declare function isDateIsoString(dateString: unknown): boolean;
/**
 * Converts a Date object to a string value for input element
 * @param date - Date object or string
 * @param typeOfInput - Type of HTML input element
 * @param withSeconds - Include seconds in time value
 * @returns String value for input element
 * @example
 * getInputValueFromDate(new Date(), 'date') // '2021-12-31'
 * getInputValueFromDate(new Date(), 'time') // '23:59'
 * getInputValueFromDate(new Date(), 'datetime-local') // '2021-12-31T23:59'
 */
export declare function getInputValueFromDate(date: Date | string, typeOfInput?: 'date' | 'time' | 'month' | 'datetime-local', withSeconds?: boolean): string;
export declare function getDateFromInputValue(value: string, typeOfInput?: 'date' | 'time' | 'month' | 'datetime-local'): Date | null;