export declare function _format(ms: number, timezone?: string): string;
export declare function _formatDate(ms: number, timezone?: string): string;
export declare function _parse(iso: string): number;
/** Render a millisecond duration as a compact human string, largest unit first:
 *  "5m 32s", "1h 1s", "2w 3d". Whole-second granularity (sub-second is "0s");
 *  largest unit is weeks. Negatives get a leading "-", but there is no "-0s". */
export declare function _formatDuration(ms: number): string;
export declare function _now(): number;
export declare function _today(timezone?: string): string;
export declare function _tomorrow(timezone?: string): string;
export declare function _nextDayOfWeek(dayName: string, timezone?: string): string;
export declare function _atTime(date: string, time: string, timezone?: string): number;
export declare function _startOfDay(instant: number, timezone?: string): number;
export declare function _endOfDay(instant: number, timezone?: string): number;
export declare function _startOfWeek(instant: number, timezone?: string): number;
export declare function _endOfWeek(instant: number, timezone?: string): number;
export declare function _startOfMonth(instant: number, timezone?: string): number;
export declare function _endOfMonth(instant: number, timezone?: string): number;