The rangevalidator object on a web form has a type property for identifying the type of data for the range, such as

numbers,  dates, currency or strings - The range validator in a web form helps check whether the value entered in the field falls between the minimum and maximum values allowed in that field. For example if the type of data accepted  is of date type, then the rangevalidator checks whether the entered date falls within the given range. That means, month entered should be between 1 and 12, etc.

You click on it and type