A Rate Component with a Time Span Comparison
A rate component that is only eligible for senior citizens has the following eligibility rule:
• Birth date equates to that of a senior citizen
This rule requires only one eligibility group on the rate component. It would look as follows:
Group
No.
Group Description
If Group is TRUE
If Group is FALSE
1
Customer Is A Senior Citizen
Apply rate component
Skip rate component
The following criterion is required for this group:
Group 1: Residential, Calif, Senior
Seq
Field to Compare
Comparison Method
If TRUE
If FALSE
If Insufficient Data
10
Main person characteristic: Date of Birth
Algorithm: True if senior
Group is true
Group is false
Group is false
The criterion contains a time span comparison. Time span comparisons are used to compare a date to something. In our example, we have to determine the age of the customer based on their birth date. If the resultant age is > 65, they are considered to be a senior citizen. To pull this off, you can take advantage of a comparison algorithm supplied with the base rate component as described below.
• Field to Compare. The person characteristic in which the customer's birth date is held is selected.
• Comparison Method. We chose a comparison algorithm that returns a value of TRUE if the related field value (the customer's date of birth) is greater than 65 years (refer to the RECC-TIMESPN algorithm for an example of this type of algorithm).
You'll notice that if a value of TRUE is returned by the True if senior algorithm, the group is true (and we've setup the group to indicate a true group means the rate component is eligible).
Note: 
The time span algorithm can be used to compare days, weeks, months, etc. Refer to the RECC-TIMESPN algorithm type for more information about this algorithm.