/** 1-based display year (1–10); null if anchor cannot be placed. Safe with Date | string inputs. */
export declare function omYearFromInvoiceAnchorDate(omStartDateIso: string | Date | null | undefined, invoiceFromDateOrBillingIso: string | Date | null | undefined, zone: string): number | null;
//# sourceMappingURL=resolveOmBillDisplayYear.d.ts.map