export declare const getCurrentTime: (d?: Date) => number;
/**
 * Calculates nearest index
 * @param initialTime initial time of streaming feed
 * @param updatePeriod streaming feed frequency in milliseconds
 * @param lookupTime lookup time
 * @returns Returns -1 if not found, otherwise the index
 */
export declare const getIndexForArbitraryTime: (lookupTime: number, initialTime: number, updatePeriod: number) => number;