/**
 * Whether now falls within an event's dates. Date-only strings (`YYYY-MM-DD`)
 * cover whole days. Read in the viewer's local time.
 */
export declare function isEventNow(startDate?: string, endDate?: string): boolean;
/**
 * Milliseconds until {@link isEventNow} flips for these dates, or `null` when it
 * never will again (no dates, unparseable dates, or the event is over).
 */
export declare function msUntilEventNowChanges(startDate?: string, endDate?: string): number | null;
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