/**
 * Helper functions for calendar operations
 */
/**
 * Get the number of days in a month
 * @param year The year
 * @param month The month (0-11)
 * @returns Number of days in the month
 */
export declare function getDaysInMonth(year: number, month: number): number;
/**
 * Get the first day of the month (0 = Sunday, 1 = Monday, etc.)
 * @param year The year
 * @param month The month (0-11)
 * @returns The day of the week (0-6)
 */
export declare function getFirstDayOfMonth(year: number, month: number): number;
/**
 * Check if two dates represent the same day
 * @param date1 First date
 * @param date2 Second date
 * @returns Boolean indicating if dates are the same day
 */
export declare function isSameDay(date1: Date, date2: Date): boolean;
/**
 * Format a date as a string
 * @param date The date to format
 * @param format Optional format string (defaults to ISO date)
 * @returns Formatted date string
 */
export declare function formatDate(date: Date, format?: string): string;
/**
 * Get month name from month index
 * @param monthIndex Month index (0-11)
 * @param short Whether to return short month name
 * @returns Month name
 */
export declare function getMonthName(monthIndex: number, short?: boolean): string;
/**
 * Get localized weekday names
 * @param short Whether to get short weekday names
 * @param firstDayOfWeek The first day of the week (0 = Sunday, 1 = Monday, etc.)
 * @returns Array of weekday names, starting with the specified first day
 */
export declare function getWeekdayNames(short?: boolean, firstDayOfWeek?: number): string[];
/**
 * Check if a date is within a range (inclusive)
 * @param date The date to check
 * @param minDate The minimum date
 * @param maxDate The maximum date
 * @returns Boolean indicating if date is within range
 */
export declare function isDateInRange(date: Date, minDate: Date | null, maxDate: Date | null): boolean;