export interface ZonedDateParts {
    /** Full year, e.g. 2026 */
    year: number;
    /** Month, 1-12 */
    month: number;
    /** Day of month, 1-31 */
    day: number;
    /** Hour, 0-23 */
    hour: number;
    /** Minute, 0-59 */
    minute: number;
    /** Second, 0-59 */
    second: number;
    /** Day of week, 0 (Sunday) - 6 (Saturday) */
    weekday: number;
}
/**
 * Break a `Date` down into its calendar/clock parts as observed in the given timezone.
 * Returns `null` if the timezone is invalid.
 */
export declare function getZonedDateParts(d: Date, tz?: string): ZonedDateParts | null;
/**
 * Get the UTC offset (in milliseconds) of the given timezone at the given instant.
 * A positive value means the zone is ahead of UTC (e.g. +60min for CET).
 * Returns 0 if the timezone is invalid.
 */
export declare function getZoneOffsetMs(tz: string, ts: number): number;
export interface WallClockFields {
    year: number;
    /** Month, 1-12 */
    month: number;
    day: number;
    hour: number;
    minute: number;
    second: number;
}
/**
 * Convert a wall-clock time (as it would read on a clock in the given timezone) into the
 * absolute UTC instant (ms) at which it occurs.
 *
 * When `tz` is undefined, the fields are interpreted in the process-local timezone, matching
 * plain `new Date(y, m, d, ...)` construction.
 */
export declare function zonedTimeToUtc(fields: WallClockFields, tz?: string): number;
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