/**
 * Parse a `--since` / `--until` value into an ISO 8601 timestamp.
 *
 * Accepts either:
 *   - Relative shorthand: `30s`, `15m`, `2h`, `1d` — interpreted as `now - duration`.
 *   - ISO 8601 string parseable by `Date.parse()`.
 *
 * Throws on unparseable input with a helpful message.
 */
export declare function parseTime(input: string, now?: Date): string;
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