Unit of specific time of the day.
        /// <summary>
        /// Delays the job for the given interval.
        /// </summary>
        /// <param name="unit">The schedule being affected.</param>
        /// <param name="interval">Interval to wait.</param>
        public static DelayTimeUnit DelayFor(this SpecificTimeUnit unit, int interval)
        {
            if (unit == null)
            {
                throw new ArgumentNullException("unit");
            }

            return(DelayFor(unit.Schedule, interval));
        }
        /// <summary>
        /// Delay first execution for the specified time interval.
        /// </summary>
        public static DelayTimeUnit DelayFor(this SpecificTimeUnit time, int interval)
        {
            if (time == null)
            {
                throw new ArgumentNullException("time");
            }

            return(DelayFor(time.Schedule, interval));
        }