/**
 * Return the number of Milliseconds to the hour for the supplied timestamp
 * @param currentTimsestamp
 * @param extra
 * @returns {number}
 * *
 * @signature
 *    U.toHour(currentTimsestamp, extra)
 * @example
 *    U.toHour('13:00') // => 1605532173
 */
export declare function toHour(currentTimsestamp: number, extra?: number): number;
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