export declare function parseDate(dateString: string, lang: string): Date | null;
export declare function getLocaleDateFromISO(isoDate: string, lang: string): string;
export declare function isISODate(date: string): boolean;
export declare function isValidDate(isoDate: string): boolean;
export declare function getISOFormattedDate(date: Date | undefined): string;
export declare function getDateFromISO(isoDate: string): Date;
export declare function monthLength(month: number, year: number): number;
export declare function parseDateRange(dateRange: string): string[];
export declare function formatDateRange(startDate: string, endDate: string): string;