/**
 * Get date range parameters with defaults
 */
export declare function getDateRange(startDate?: string, endDate?: string): {
    startDate: string;
    endDate: string;
};
/**
 * Format a local calendar date as YYYY-MM-DD
 */
export declare function formatDate(date: Date | string | undefined | null): string;
/**
 * Format currency amounts for display
 */
export declare function formatAmount(amount: number | undefined | null): string;
export declare function getDateRangeForMonths(months: number): {
    start: string;
    end: string;
};
/**
 * List the N most recent months as `YYYY-MM` strings, oldest first,
 * ending with the current month.
 */
export declare function getRecentMonths(months: number): string[];
/**
 * Render a `YYYY-MM` month key as a short human label, e.g. `Jul 2026`.
 */
export declare function formatMonthLabel(month: string): string;
/**
 * Last calendar day of a `YYYY-MM` month, as a Date.
 */
export declare function endOfMonth(month: string): Date;
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