| DateRange | 
 Constrain the range of generated date parameters. 
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| DayOfMonthRange | 
 Constrain the range of generated day of month parameters. 
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| DayOfWeekRange | 
 Constrain the range of generated day of week parameters. 
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| LeapYears | 
 Decide whether leap years are generated or not 
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| MonthDayRange | 
 Constrain the range of generated month and day parameters. 
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| MonthRange | 
 Constrain the range of generated month parameters. 
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| PeriodRange | 
 Constrain the range of generated periods. 
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| YearMonthRange | 
 Constrain the range of generated year and month parameters. 
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| YearRange | 
 Constrain the range of generated year parameters. 
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