import type { DateTime } from '@gravity-ui/date-utils';
export declare function isWeekend(date: DateTime): boolean;
export interface PlaceholderValueOptions {
    placeholderValue?: DateTime;
    timeZone?: string;
}
export declare function createPlaceholderValue({ placeholderValue, timeZone }: PlaceholderValueOptions): DateTime;
export declare function isInvalid(value: DateTime | null | undefined, minValue: DateTime | undefined, maxValue: DateTime | undefined): boolean;
export declare function constrainValue(value: DateTime, minValue: DateTime | undefined, maxValue: DateTime | undefined): DateTime;
export declare function mergeDateTime(date: DateTime, time: DateTime): DateTime;
export declare function formatDateTime(date: DateTime, format: string, timezone: string, lang: string): string;