/**
 * Parse a user-supplied point in time for --since/--until style flags.
 *
 * Accepted forms:
 * - `Nh` / `Nd` / `Nw` — N hours/days/weeks before `now` (e.g. `7d`).
 * - `YYYY-MM-DD` — a local calendar day; `boundary` picks its start (00:00:00.000)
 *   or end (23:59:59.999) so `--until 2026-06-30` includes the whole day.
 * - anything `new Date()` accepts, e.g. a full ISO datetime.
 *
 * `now` is injected rather than read from the clock so callers share one reference
 * instant per run and tests are deterministic.
 */
export declare function parseWhen(input: string, opts: {
    now: Date;
    boundary: 'start' | 'end';
}): Date;
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