/**
 * The native start times, in the one shape a listing row reports.
 *
 * The six stores write four shapes for the same fact: ISO 8601 UTC with
 * milliseconds (claude, codex, pi), ISO 8601 UTC at second precision
 * (antigravity), epoch microseconds (muse) and epoch milliseconds (cursor).
 * A row that carried them as written could not be compared or sorted, so
 * every one is converted here. This layer cannot construct a `Date`, so the
 * civil-date arithmetic is written out.
 */
/** A native ISO 8601 UTC time at millisecond precision, or null when the text
 * is not one. A store that names an offset rather than `Z` reports null
 * rather than being read as UTC. */
export declare function utcTime(text: string): string | null;
/** Epoch milliseconds as a UTC time, or null outside the span a date names. */
export declare function utcTimeFromEpochMillis(millis: number): string | null;
/** Epoch microseconds as a UTC time. Muse counts in microseconds; the
 * sub-millisecond digits are dropped rather than rounded, so the reported
 * time never runs ahead of the native one. */
export declare function utcTimeFromEpochMicros(micros: number): string | null;
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