/** The UTC calendar day of an instant, as `YYYY-MM-DD`. */
export declare function toDay(date: Date): string;
/** The day `n` days after `day` (negative `n` moves backward). */
export declare function addDays(day: string, n: number): string;
/** Every day in `[from, to]` inclusive, ascending. Empty when `from > to`. */
export declare function dayRange(from: string, to: string): string[];
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