import { AppointmentSlot } from '@fanfare-io/fanfare-sdk-core/appointments';
/**
 * Date / time formatting helpers shared across the appointment picker
 * components. Every helper falls back to the input string when given an
 * unparseable value or when `Intl.DateTimeFormat` throws on a bad `timeZone`
 * (it raises `RangeError: Invalid time zone specified`), so a bad input can
 * never crash the render.
 */
export declare function formatTime(value: string, timezone?: string): string;
/** Format the start time of an appointment slot, falling back to its id string. */
export declare function formatSlotTime(slot: AppointmentSlot): string;
/**
 * Return the YYYY-MM-DD calendar date of `date` as seen in `timezone`.
 * Buckets slots by day and renders the day strip. `sv-SE` produces
 * ISO-format output, so it doubles as a TZ-shifted date key.
 */
export declare function isoDateInTimezone(date: Date, timezone?: string): string;
/** Add `days` calendar days to a YYYY-MM-DD date string. Calendar-day arithmetic only. */
export declare function addCalendarDays(isoDate: string, days: number): string;
/**
 * Weekday label (e.g. "Mon") for a YYYY-MM-DD calendar date. Uses noon UTC so
 * a TZ offset can't push the formatter to the wrong weekday.
 */
export declare function weekdayLabel(isoDate: string): string;
/** Day-of-month from a YYYY-MM-DD calendar date. */
export declare function dayOfMonth(isoDate: string): number;