import { z } from 'zod';
/**
 * Parses an operational HH:MM.
 *
 * Rules:
 * - minimum is 04:00
 * - maximum is 29:59
 * - minutes must be 00–59
 * - hour must be at least 2 digits in stored format
 */
export declare function operationalHhmmToMinutes(hhmm: string, ignoreStartHour?: boolean): number;
/**
 * Converts common typed time formats into strict HH:MM.
 *
 * Examples:
 * - "800" -> "08:00"
 * - "0800" -> "08:00"
 * - "2200" -> "22:00"
 * - "2600" -> "26:00"
 * - "8:00" -> "08:00"
 * - "26:00" -> "26:00"
 *
 * Returns null if it cannot normalize safely.
 */
export declare function normalizeOperationalHhmmInput(value: string): null | string;
export declare const HHMMSchema: z.ZodBranded<z.ZodEffects<z.ZodString, string, string>, "HHMM">;
export type HHMM = z.infer<typeof HHMMSchema>;
/**
 * Runtime-safe creator (validates + brands)
 */
export declare const hhmm: (value: string) => HHMM;
export declare function timeToMinutes(time: HHMM | string, ignoreStartHour?: boolean): number;