export declare function parseTimestamp(value: string | undefined): number | undefined;
export declare function durationSecondsBetween(start: string | undefined, end: string | undefined): number | undefined;
export declare function formatDuration(seconds: number | undefined): string;
/** True for a bare YYYY-MM-DD, which Date.parse reads as midnight UTC. */
export declare function isDateOnly(value: string): boolean;
/** Depot's usage RPCs take google.protobuf.Timestamp values, which JSON-encode as RFC 3339. */
export declare function toRfc3339(value: string): string;
/**
 * For the end of a window, a bare date means "through the end of that day". Date.parse reads it
 * as midnight at the start of the day, which would silently exclude the whole day, so advance to
 * the next midnight UTC. Full timestamps are taken as given.
 */
export declare function toRfc3339WindowEnd(value: string): string;
export declare function daysAgoRfc3339(days: number, now?: number): string;
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