export declare function formatDate(date: Date | string, formatStr: string, timezone?: string): string;
export declare function formatTime(date: Date, timeFormat: '12' | '24', timezone?: string): string;
export declare function formatDuration(seconds: number): string;
export declare function formatRelativeTime(date: Date | string): string;
export declare function getCurrentTime(timezone?: string): Date;
export declare function isWithinHours(date: Date | string, hours: number): boolean;
export declare function getSessionWindowStart(now?: Date): Date;
export declare function inSameSessionWindow(date1: Date, date2: Date): boolean;
export declare function getSessionTimeRemaining(sessionStart: Date): number;
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