/**
 * checkin/quiet-hours.ts
 *
 * Quiet-hours parsing and evaluation, split out so it is unit-testable in
 * isolation. Format is 'HH:MM-HH:MM' in local time; an empty/invalid string
 * means "no quiet hours". A window whose end is <= its start wraps past
 * midnight (e.g. '22:00-08:00' is quiet from 10pm through 8am).
 */
interface QuietWindow {
    readonly startMinutes: number;
    readonly endMinutes: number;
}
export declare function parseQuietHours(spec: string): QuietWindow | null;
/** Whether the given instant (local time) falls within the quiet-hours window. */
export declare function isQuietHours(now: number, spec: string): boolean;
export {};
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