internal AfterSingularBuilder(JobConfiguration config) : base(config) { }
internal AtBuilder(JobConfiguration config) : base(config) { }
internal HoursBuilder(JobConfiguration config) : base(config) { }
internal AfterPluralBuilder(JobConfiguration config) : base(config) { }
internal NthDayOfWeekBuilder(JobConfiguration config) : base(config) { Configuration.CalculateNext = next => next.AddWeeks(Configuration.N); }