/**
 * Date/time primitive type helpers. Pure, UTC-only, deterministic.
 * Representations (docs/spec/semantics.md, Date/Time Types):
 *   datetime = finite epoch ms within the representable Date range (±8.64e15);
 *   duration = finite ms;
 *   date = "YYYY-MM-DD" (valid calendar); time = "HH:MM:SS" (00:00:00–23:59:59).
 */
/** Authoritative date/time primitive type names (docs/spec/semantics.md § Date/Time Types). */
export declare const DATE_TIME_TYPE_NAMES: readonly ["date", "time", "datetime", "timestamp", "duration"];
/** True when the IR type name is datetime or its `timestamp` alias. */
export declare function isDatetimeTypeName(typeName: string): boolean;
export declare function isValidDateString(value: unknown): boolean;
export declare function isValidTimeString(value: unknown): boolean;
export declare function dateOf(ts: unknown): string | null;
export declare function timeOf(ts: unknown): string | null;
export declare function datetimeOf(dateStr: unknown, timeStr?: unknown): number | null;
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