/**
 * Date / Time Functions — Native RuntimeValue implementation.
 *
 * All Date objects returned by `excelToDate()` represent an Excel serial on
 * the UTC timeline (midnight UTC for the corresponding date). Consequently
 * every field accessor must be the UTC variant (`getUTCFullYear`,
 * `getUTCMonth`, …) and every `Date` constructed from y/m/d components must
 * be built with `Date.UTC(...)`. Using local-time accessors would make
 * results depend on the host timezone — e.g. `YEAR(DATE(2024,1,1))` would
 * return 2023 when evaluated on a machine west of UTC at midnight UTC.
 *
 * Exceptions (intentionally use local time):
 * - `TODAY` / `NOW` — read the user's wall clock, which is genuinely in the
 *   local timezone. The Excel serial is then constructed using
 *   `Date.UTC(year, month, day)` so that the resulting serial round-trips
 *   correctly through `excelToDate()`.
 */
import type { RuntimeValue } from "../runtime/values.js";
type NativeFn = (args: RuntimeValue[]) => RuntimeValue;
/**
 * TODAY — today's date (at the user's local timezone).
 *
 * The user's concept of "today" is based on their wall clock, so we read
 * local-time fields from `new Date()`. The resulting y/m/d components are
 * then packed into a UTC serial so downstream date arithmetic is consistent.
 */
export declare const fnTODAY: NativeFn;
/**
 * NOW — current date and time.
 *
 * Excel stores the result as an untimezoned serial, but the user expects
 * their local wall-clock reading. `dateToExcel(new Date())` effectively
 * takes `Date.now()` in UTC-ms; any conversion to the user's timezone
 * would require tz metadata we do not have. We therefore keep the current
 * UTC-ms based conversion, matching historical behaviour.
 */
export declare const fnNOW: NativeFn;
export declare const fnYEAR: NativeFn;
export declare const fnMONTH: NativeFn;
export declare const fnDAY: NativeFn;
export declare const fnDATE: NativeFn;
export declare const fnTIME: NativeFn;
export declare const fnHOUR: NativeFn;
export declare const fnMINUTE: NativeFn;
export declare const fnSECOND: NativeFn;
export declare const fnWEEKDAY: NativeFn;
export declare const fnEOMONTH: NativeFn;
export declare const fnEDATE: NativeFn;
export declare const fnDATEDIF: NativeFn;
export declare const fnDAYS: NativeFn;
export declare const fnISOWEEKNUM: NativeFn;
export declare const fnWEEKNUM: NativeFn;
export declare const fnNETWORKDAYS: NativeFn;
export declare const fnWORKDAY: NativeFn;
export declare const fnYEARFRAC: NativeFn;
export declare const fnDATEVALUE: NativeFn;
export declare const fnTIMEVALUE: NativeFn;
export declare const fnDAYS360: NativeFn;
export declare const fnNETWORKDAYS_INTL: NativeFn;
export declare const fnWORKDAY_INTL: NativeFn;
export {};