/**
 * Upload date = last calendar day of the month before the invoice generation month.
 * `billingPeriodKey` is YYYY-MM-01 (first day of billing month).
 */
export declare function computeUploadDateFromBillingPeriodKey(billingPeriodKey: string, timezone: string): string | null;
export declare function formatUploadDateDisplay(iso: string, timezone: string): string;
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