/**
 * Utility functions for date operations
 */
/**
 * Get a start date based on the specified timeframe
 * @param timeframe The timeframe to calculate the start date for
 * @returns The calculated start date
 */
export declare function getDateRangeFromTimeframe(timeframe: 'week' | 'month' | 'quarter' | 'year' | 'all'): Date;