/**
 * Date Utilities
 *
 * Pure functions for date operations and formatting.
 * No side effects, timezone-aware operations.
 *
 * SOLID: Single Responsibility - Only date operations
 * DRY: Reusable date utility functions
 * KISS: Simple, focused functions
 */
export declare class DateUtilities {
    /**
     * Format date to string (YYYY-MM-DD)
     */
    static formatDateToString(date: Date): string;
    /**
     * Check if two dates are the same day
     */
    static isSameDay(date1: Date, date2: Date): boolean;
    /**
     * Add days to a date
     */
    static addDays(date: Date, days: number): Date;
    /**
     * Check if date is today
     */
    static isToday(date: Date): boolean;
    /**
     * Get current timezone
     */
    static getCurrentTimezone(): string;
    /**
     * Get start of month
     */
    static getStartOfMonth(date: Date): Date;
    /**
     * Get end of month
     */
    static getEndOfMonth(date: Date): Date;
    /**
     * Get number of days in month
     */
    static getDaysInMonth(date: Date): number;
    /**
     * Get start of week (Sunday)
     */
    static getStartOfWeek(date: Date): Date;
    /**
     * Get end of week (Saturday)
     */
    static getEndOfWeek(date: Date): Date;
    /**
     * Parse date from string (YYYY-MM-DD)
     */
    static parseDate(dateString: string): Date;
    /**
     * Format time to string (HH:MM)
     */
    static formatTimeToString(date: Date): string;
    /**
     * Check if date is in the past
     */
    static isPast(date: Date): boolean;
    /**
     * Check if date is in the future
     */
    static isFuture(date: Date): boolean;
}